IMPROVEMENTS IN ELECTRICAL SWITCHES CHIEFLY DESIGNED FOR USE TELEPHONIC APPARATUS
Year: 1883

page_text: "
LETTERS PATENT to Henry Harris Lake, of the firm of Haseltine, Lake,
and Co, Patent Agents, Southampton Buildings, London, for an Invention of
IMPROVEMENTS IN ELECTRICAL SWITCHES CHIEFLY DESIGNED FOR USE
TELEPHONIC APPARATUS communicated to him from abroad by
Charles William Holden, of Boston, Massachusetts, United States of America
WITH
"
PROVISIONAL SPECIFICATION left by the said Henry Harris Lake at the
Office of the Commissioners of Patents on the 5th September 1883.
CHIEFLY DESIGNED FOR USE WITH TELEPHONIC APPARATUS
"
HENRY HARRIS LAKE, of the firm of Haseltine, Lake, and Co., Patent Agents,
Southampton Buildings, London, "IMPROVEMENTS IN ELECTRICAL SWITCHES
[A communication
to him from abroad by Charles William Holden, of Boston, Massachusetts, United
States of America]
This invention relates to switches for telegraphic and telephonic purposes.
The present improvements are more especially designed for telephonic circuits
and instruments and will be described with particular reference thereto and
essentially they are in three parts which in substance are as follows;-
First. The telephonic receiver, at all times, and whether in or out of use, is
carried by an arm or lever arranged to be moved forwards and backwards upon
another arm and support therefor, and the said lever and support are provided with
contact surfaces or studs or posts, each and all insulated therefrom but connected
with the call and telephone circuits, and otherwise arranged in relation to each
other, all substantially as hereinafter described, and in such a manner that a
movement of the lever carrying the receiver, in one direction disconnects the
call-circuit from the main-line, brings in the receiver and secondary circuit of the
transmitter, and at the same time completes the primary local circuit of the
transmitter while a movement of the said lever in the other direction, cuts out
the receiver and secondary circuit of the transmitter and restores the call-circuit.

page_text: Again the telephonic receiver, at all times, and whether in or out of use, is
carried by a lever arranged to be moved forward and backward upon another and
supporting arm therefor, in one direction against, and in the other direction from,
the reaction of a spring suitably applied therefor to the said lever and its support,
and the said lever and support are provided with contact surfaces or studs or posts,
each and all insulated therefrom, but connected with the call and telephone
circuits, and otherwise arranged in relation to each other all substantially as
hereinafter described, and in such a manner that a movement of the lever
carrying the receiver, in one direction, and against the said spring, disconnects
the call-circuit from the main-line, brings in the receiver and secondary circuit of
the transmitter, and at the same time, completes the primary local circuit of the
transmitter; while a movement of the said lever in the other direction, and from
the reaction of the said spring, cuts out the receiver and secondary circuit of the
transmitter, and restores the call circuit.
Again, the said lever carrying the telephonic receiver, and combined with a
supporting arm therefor, and otherwise constructed, arranged and combined with
the telephonic receiver, and primary and secondary local circuits of the transmitter
and the local circuit of the main line in accordance with either one or both of the
preceding clauses, is provided with fenders or guards constructed and arranged
for an abutment in a manner to limit, at the proper time, the movement of the
said carrying lever independent of its contact between its stud or studs or posts
and the contact studs of its supporting arm.
Second. An arm or lever is arranged to be moved forward and backward upon a
support which carries a series of studs or posts all insulated therefrom, but
connected with the call and telephonic circuits, and the said arm is linked or
connected to a switching lever or plate but insulated therefrom, and it and the
said switching lever are arranged and adapted in such a manner, that a movement
of the said arm in one direction, so operates the said switching lever, as through it
to disconnect the call circuit from the main line, bring in the receiver and secondary
circuit of the transmitter, and at the same time to complete the primary local circuit
of the transmitter, while a movement of the said arm in the other direction, cuts
out the receiver and secondary circuit of the transmitter and restores the call
circuit.
Then, again an arm is arranged to be moved forward and backward upon a
support which carries a series of studs or posts all insulated therefrom, but
connected with the call and telephonic circuits, and the said arm is linked or
connected to a switching lever or plate but insulated therefrom, and it and the
said switching lever, are arranged and adapted in such a manner that a movement
of the said arm, in one direction, and in that direction against a spring, so operates
the said switching lever, as through it to disconnect the call circuit from the main
line, bring in the receiver, and secondary circuit of the transmitter, and at the
same time complete the primary local circuit of the transmitter while a movement
of the said arm, in the other direction and in that direction, from a reaction of
said spring, cuts out the receiver and secondary circuit of the transmitter and
restores the call circuit.
Third. In the practice of the telephonic system of communication, central offices
so termed, are established through which, on notification, the necessary electric
connections or circuits for telephonic communications are made, as the same may
be requested, as for instance, either between local stations belonging either to the
same central office, or to different central offices, or between different central offices
and so on, as well known.
In all cases, at each central office, all the separate local stations and the separate
central offices connected therewith, are represented by separate and distinctively
numbered or otherwise marked and designated signal drops or rather "annunciator
drops" as they are more particularly called.
These drops are each arranged and otherwise connected so that when a call is
made, or rather rung in, as it is termed at a central office from another central

page_text: office, or from a local station of the several central offices and local stations
represented by the said annunciator drops, the annunciator drop corresponding
thereto will fall, or otherwise be so changed in position, as to notify the central
office thereof, when said drop is replaced, and the desired connection or circuit for
the telephonic communication is made, after which on its being finished, a calling
or ringing in, as before is again made, similarly notifying the central office of the
fact, when the drop is again replaced and the electric connection or circuit for
telephonic communication, made as before stated, is broken, all as well known.
This calling or ringing in of a central office heretofore has been accomplished
by means, as for instance a magneto machine, as it is called, which is separate and
distinct from the telephonic switch of each local station or central office, as the
case may be, and by the movement of which the said local station or central
office, as the case may be, is placed out of the call circuit and into the telephonic
circuit and vice versa of the central office being called or rung in.
The object of the third part of this invention is to dispense with these said
separate and distinct means such as the magneto machine, for the purpose of
calling or ringing in the central office, as above described, or in other words, in
substance, to secure by the movement alone of the said switch either from the
call to the telephonic circuit or from the telephonic to the call circuit, the
calling or ringing in and notification of the central office as above explained.
To this end, it consists essentially in the combination with the mechanism and
circuit connections of telephonic switches and instruments as ordinarily or
otherwise suitably arranged, of mechanism and a circuit connection therefor, to
secure from the passage of the switch from the call to the telephone circuit, or
vice versa, a signalling of the central office in accordance therewith, all substantially
as described.
In addition to the improvements above referred to, there are many other in the
details of the switch all of which will hereinafter fully appear.
In carrying the said invention into practice I provide a telephonic transmitter ;
a telephonic receiver, a local battery, a magneto-machine, call-bells, and an
annunciator drop at the central office, each and all of any of the usual
constructions and arrangements of parts and therefore needing no particular
description herein.
The receiver is clamped within a clamping ring, surrounding its body, and this
ring in turn is secured, through an intervening hinge or joint in two parts at right
angles to each other, to an arm or lever. This lever between its two ends, is
fulcrummed upon an arm or support and thus adapted for a forward and backward
swing or movement thereon. This support is fixed in position in any suitable
manner, for instauce upon an adjustable standard or upon a stationary box, and in
both cases the said support is jointed thereto with a hinge or joint in two parts,
all of which forms no part of this invention so will not be more particularly
described.
In the swing of the said arm or lever one part crosses the support and either the
said part of the lever or the said support for the lever, or both, are provided with
electrically connected contact surfaces or studs or posts.
One post is sometimes carried by the support and two posts by the said lever
one at each side of the first post, and at such distance from each other and in
relation to the first post, that swinging the lever in one direction brings the second
post into contact with one side of the first post and the third post out of contact
at the opposite side thereof, and swinging the said lever in the other and opposite
direction, brings the third post into contact with one side of the first post, and the
second post out of contact at the opposite side thereof.
A fourth post is sometimes carried by the support and a fifth post by the lever,
and these posts are situated for the fifth post to make and be in contact with the
fourth post when the third post makes and is in contact with the first post, and to
have the said contact broken when the third post is out of contact with the first
post and the second post is in contact with the first post.

page_text: The first post is sometimes carried by the lever and the second, third, fourth,
and fifth posts are all carried by the support, the second post being at one side and
the third, fourth, and fifth posts all at the other side of the first post and severally
arranged for the first post, when the lever is swung in one direction to make
contact with the second post and be out of contact with the third, fourth, and fifth
posts and swung in the other direction to make contact with the said third, fourth,
and fifth posts, and be out of contact with the first post.
All five posts are sometimes carried by the support, the second and fourth being
at one side and the third and fifth at the other side, of the first post which is
above a horizontal switching plate of the said support, which switching plate is
linked to the said lever and turns on a fulcrum of the said support.
This switching plate and posts, and their construction and arrangement, will be
hereinafter particularly and fully described.
The five posts are made of metal or of other material suitable for an electric
conductor, and also for the attachment of an electric conducting wire, and in their
arrangement above described either upon the lever or upon its support or upon
both, all are insulated therefrom, as for instance with hard unvulcanized india-
rubber or other suitable material, and the switching plate and its fulcrum and
link connection are also similarly insulated from the lever and support.
The wire connections between the posts, a telephonic receiver, a telephonic
transmitter a local battery, the bells, a magneto machine, and the ground and main
line running to the annunciator drop at the central office will be hereinafter
explained.
These wires consist of a wire connecting the first post with the main line which
passes to ground; a second wire connecting the second post with the bells and
the ground passing through the magneto machine when that is used; a third wire
running from the third post into and out of both the receiver and transmitter to
the ground; a fourth wire running from one pole of a local battery to, and through,
the primary coil of the transmitter and from thence to the fifth post which is
connected by a metal plate or other electrical conductor of suitable material to the
third post; and a fifth wire leading from the fourth post to the other pole of the
said local battery
These several wire connections between the several posts and the receiver,
transmitter, local battery, bells, magneto machine, ground and main line, are as
usual, and from thein, First with the first post in contact with the second post,
the call circuit is established with the main line, that is from the main line along
the first wire, to the first post, and through said post to, and through, the second
post, and thence by the second wire to the bells, magneto machine, and ground.
Second the first post in contact with the third post, and the fourth post in contact
with the fifth post or what is the same thing, the first post in direct contact with
the third, fourth, and fifth, posts together with the metallic plate, the third and
fifth posts between the telephonic circuit is established with the main line, that
is from the main line along the first wire to the first post, and through the said
post to and through the third post, and thence by the third wire to and through
the receiver and transmitter and from thence to the ground. And also another
circuit is established by the fourth wire from the primary coil of the transmitter
to, and through, the fifth post and from thence through the fourth post and a fifth
wire and both poles of the local battery, and the fourth wire with the transmitter,
thus completing the circuit between the transmitter, receiver, and local battery.
When the call circuit, by bringing the first post into contact with the second
post is established, the telephonic and other circuits above described as made at
the same time with the said telephonic circuit, are broken, and again, when the
telephonic and other circuits above described as made at the same time with
Baid telephonic circuit are established, by bringing the first post into contact with
the third post, the call circuit is broken and either of the said two classes of circuits
is established as the case may be by swinging the lever in the one or the other
direction upon its fulcrum, and these operations obviously are each capable of

page_text: being accomplished without removal of the receiver from the said lever, or, in other
words, from its support, and either by pressure upon the lever from the hand of
the operator or from resting the ear against the receiver when being used.
The lever carrying the receiver has a spring at one end attached to it, and at the
other end attached to the support, all in a manner for the movement of the said
lever, in the one direction as herein described, to break the call circuit and establish
the telephone and other circuits, to be against the said spring, and in the other
direction as herein described, to establish the call circuit and break the telephonic
and other circuits from the reaction of the said spring, whereby, as is apparent, all
liability of the call circuit being accidentally left broken or cut out when ceasing
to use the telephone, or its not being used, is obviated absolutely.
In the arrangement of the posts, first described either the second or third post
as the case may be by the described swing of the lever is brought into contact
with the first post, whereas in another arrangement of the contact posts relative to
the lever and its support by the described swing of the lever the first post is
brought into contact, with either the second or third post as the case may be; the
first post in both arrangements being the post connected by the first wire to the
main line.
The swinging lever has a fender or guard projecting therefrom on opposite sides
of its support and in position to respectively abut against the said support as the
lever is swung to make the contacts between the contact posts herein described and
at the times such contacts are made, and thus by such abutments thereof prevent
any undue strain or pressure between the contact posts when contact is made by
them, either for the call circuit, or for the telephonic and other circuits herein
described.
If desired, the lever having the receiver together with the supporting arm
therefor may be arranged for the one to have a rectilinear movement upon the
other instead of a swinging movement as has been herein particularly described and
shewn.
Again, if desired, the contact posts may be provided with screws, at one end,,
making the contacts of the posts, by reason of which, as is obvious, the contact'
posts can be readily adjusted to compensate for their wear from use.
:
Fenders or guards may be arranged upon the support instead of upon the forward,
and backward moving lever to which the telephonic receiver is attached.
The switching plate herein-before referred to, is made of metal, or of other
suitable electric conducting material and it passes between the second, third, fourth.
and fifth posts and along its two edges, it is shaped so that if the lever is swung
upon its fulcrum, in one direction (the switching plate being operated thereby) one
part of the said switching plate will come into contact with the side of the second
post, and the other parts of the said switching plate be placed out of direct contact
respectively either with the third, fourth, and fifth posts or with metallic or other
electric conducting plates or surfaces attached to the said posts so that, if the lever'
is swung upon its fulcrum in the opposite direction (the switching plate being
operated thereby) the first mentioned part of the said switching plate will come
into direct contact with the side of the third post, another part with the side of the
fourth post, and another part with the side of the fiftli post, or in the case of each of
said posts, into contact with the metal plate or surface attached thereto respectively
by riding or passing over the same, and one part of the said switching plate will be
placed out of contact with the second post.
The fifth post has sometimes an extension or arm of metal or other suitable
electric conducting material which is shaped at its free end to rest with a yielding
pressure upon, and thus make contact with, the upper surface of the metal switching
plate when said switching plate is hung upon a fulcrum-pin separate from the first
post. If the first post forms the fulcrum, for the switching plate, then this extension
or arm of the first post may be dispensed with.
The several wire connections between the several posts and the receiver,,
transmitter, local battery, bells, magneto-machine, ground, and main line are as

page_text: usual, and together with a switching plate of the construction, arrangement and
operation, described, as to contact between its parts and the said posts or metallic
plates or surfaces connected therewith, and together with a metal connection either
by the extension or arm, or by the first post between the said switching plate and
the said first post establish, First with the switching plate in contact with the
second post and the said switching plate out of contact with the third fourth, and
fifth posts the call circuit with the main line, that is from main line along the first
wire to the first post and thence through the second post along the second wire to
the bells, magneto machine, and ground, and they establish, Second with the
switching plate in contact with the third, fourth, and fifth posts or what is the
same thing in contact with the metallic plates or surfaces respectively of the said
posts and the said switching plate in contact with the third post, the telephonic
circuit with the main line along the first wire to the first post and through the
said post to and through the third post, and thence by wire the third to, and
through, the receiver and transmitter to the ground. And also they then establish
another circuit by the fourth wire from the primary coil of the transmitter to, and
through, the fifth post, and from thence by the switching plate through the fourth
post and the fifth wire, and both poles of the local battery, and the fourth wire
with the transmitter, thus completing the circuit between the transmitter, receiver,
and local battery.
When by bringing the switching plate into contact with the second post the call
circuit is established the telephonic and other circuits above described as made at
the same time with the said telephonic circuit are broken, and again, when by
bringing the switching plate into the contact described with the third, fourth, and
fifth posts, the telephonic and other circuits above described as made at the same
time with the said telephonic circuit are established, the call circuit is broken, and
either of these two classes of circuits is established as the case may be, by swinging
the lever in the one or the other direction upon its fulcrum, and through the swing
of said lever swinging the switching plate, and these operations obviously are cach
capable of being accomplished, without removal of the receiver from the said lever,
or in other words from its support and either by pressure upon the lever from the
hand of the operator or from resting the ear against the receiver when being used.
The parts of the switching plate making the electric connections between the
said plate and the third fourth, and fifth posts and securing the establishment of
the telephonic and other circuits as has been described are each shaped together
with the metal plates of said posts belonging to them, so that contact will be
maintained at, or ensured between, the said parts of the switching plate and the
said plates of the posts until the switching plate has reached the extreme limit of
its swing to break the said telephonic and other circuits, the advantage of which
is obvious, in the use of the receiver and transmitter, as it allows the ear to bo
removed from the receiver either accidentally or intentionally as it and the
transmitter are being used, without necessarily breaking the circuit previously
established for their being used.
A great advantage of some of the telephonic switches is in the fact that as all
the wire connections are made with posts upon the support and with no post or
posts upon the swinging lever, there is no danger of the wires becoming entangled
or interfering in any way with the use of the said lever, and again it allows the
posts to be boxed or cased thus protecting them against liability of injury from any
cause whatever.
A horizontal rod sometimes passes through, and from side to side, of, a block
supporting or carrying the first post, and other posts, and also has at its middle a
cam or excentric portion, in contact with the under side of the extension or finger
piece herein before described, and making the electric connection between the said
first post and the switching plate. This excentric and rod are arranged to be
turned freely within the said block, and for convenience in turning them the rod
has at one of its projecting ends a milled head and is shouldered at both projecting
ends, to hold it as it is turned against escape from the said block.

page_text: The excentric is shaped so that turned in one direction partially around, it will,
by working against the underside of the extension, lift the samne sufficiently to
break electric connection with the said switching plate and also hold it thus lifted
as long as the said excentric remains stationary and in such position relative to its
said extension, when by continuing to turn the excentric in the same direction it
will allow said extension to drop or move and bear upon the said switching plate
to re-establish electric connection between the said switching plate and the first
post which may be continued so long as the said excentric then remains in such
position relative to said extension
An excentric constructed, arranged, and operating upon said extension as above
described, plainly permits, by a simple turning of it the telephonic instruments, to
be at any time instantly and completely put out of and into, electric connection,
thereby providing most efficient and ready means of making the instruments safe
against accident and casualties during electrical storms, and also at, and during,
such other times as may be desired.
Sometimes the first post which is connected with the main line has a horizontal
spring-finger-piece or prong which projects from it, and into position for a
horizontal finger-piece or prong that is carried by a lever as the said lever is
swung upon its fulcrum, to make and break the circuits as has been described, to
pass or slide over and in contact with said finger piece.
The finger piece of the lever is part of a metal plate connected to a sixth post
of the switch, all insulated from the lever, and this sixth post, in either position of
the lever, has no contact with the posts of the support.
The sixth post of the lever is connected by a sixth wire with one pole of a local
battery, the other pole of which is connected with the ground and consequently
with the finger pieces or prongs of the lever and its support in contact therewith,
a circuit thus established through the main line local battery ground and
annunciator drops in the central office, and through its action the said annunciator
at the central office is made to fall or drop, and thus the central office is notified
and signalled as usual.
This contact of the prongs of the lever and support is made in either movement
of the lever, and during the passage of the lever from the call circuit to the
telephone circuits, and vice versa, and it secures a similar signalling of the central
office in both cases provided the annunciator drop, after it has dropped in passing
from call to telephonic circuit, or vice versa, has been replaced.
Heretofore this signalling of this central office has been accomplished with a
magneto-machine or other means which are operated, separately and distinctly
from the operation of the telephone lever or switch, while in the arrangement of
contact prongs just described the movement itself of the lever alone signals the
central office.
A local battery separate from the ordinary local battery may be used for making
the electric circuit for the intervening switching prongs of the lever or switch, and
its support.
This battery, however, may be dispensed with, and the connection of the sixth
post made by wire with the ordinary local buttery, or again a battery in the main
line may be employed.
Yielding or unyielding contacts for the switch and its support may be used, but
yielding contacts obviously are preferable, and again the intermediate electric
circuit connection made as the switch or lever passes from call to telephone
circuit or vice versa, obviously may be applied to other forms of switches as well as
that herein particularly described, and therefore this invention as to this feature is
not to be limited thereto.
The ordinary local battery may be dispensed with in which case the fourth and
fifth posts would not be required but it is preferable to use it. While the arm or
lever forming the lever as it were for operating the switching plate of the telephonic
switch has been herein particularly described as carrying the telephone receiver,
and with manifest advantages and conveniences; it is plain that the telephone

page_text: receiver may be removed therefrom and be carried and supported independently
thereof, and without in the least degree affecting the operation of the switching
plate by and from the movement of the switching lever upon its support.
Therefore it is not intended to limit the use of the switching plate in any respect
to the fact that the said lever as described, does carry the said receiver, although,
as is obvious, it is preferable that it should and for that reason has been so
particularly described.
A U-shaped spring dog or catch is sometimes hung upon an ear piece of the lever
support. This spring-catch is arranged so that with the first post in contact with
the second post its end will be interlocked with, or abutted against, the inner edge
of the fender of the lever and thus made to fasten the said lever against movement
until it has been released by pressing its handle toward the catch. The spring of
the catch acts to hold it engaged as above described and to place it automatically
into engagement when contact is made by the first post with the second post.
The catch engaged, obviously prevents accidental movement of the lever from call
to telephonic circuits.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Henry Harris Lake in the Patent Office on the 5th March
1884.
HENRY HARRIS LAKE, of the firm of Haseltine, Lake, and Co Patent Agents,
Southampton Buildings, London "IMPROVEMENTS IN ELECTRICAL SWITCHES,
CHIEFLY DESIGNED FOR USE WITH TELEPHONIC APPARATUS." A communication
to me from abroad by Charles William Holden of Boston, Massachusetts, United-
States of America
This invention relates to electrical switches which are especially designed for
telephonic circuits and instruments, they will therefore be described with particular
reference thereto
The said invention is divided into three parts as follows, that is to say, first.
The telephonic receiver, at all times and whether in or out of use, is carried by an
arm or lever arranged to be moved forward and backward upon another arm and
support therefor and the said lever and support are provided with contact surfaces
or studs or posts, each and all insulated therefrom but connected with the call and
telephone circuits and otherwise arranged in relation to each other all substantially
as hereinafter described and in such a manner that a movement of the lever
carrying the receiver, in one direction disconnects the call-circuit from the main
line, brings in the receiver and secondary circuit of the transmitter and at the same
time completes the primary local circuit of the transmitter, while a movement of
the said lever in the other direction cuts out the receiver and secondary circuit of
the transmitter and restores the call-circuit.
Again the telephonic receiver, at all times, and whether in or out of use, is
carried by a lever arranged to be moved forward and backward upon another and
supporting arm therefor, in one direction against, and in the other direction from
the reaction of a spring suitably applied therefor to the said lever and its support,
and said lever and support are provided with contact surfaces or studs or posts
each and all insulated therefrom, but connected with the call and telephone circuits,
and otherwise arranged in relation to each other all substantially as hereinafter
described, and in such a manner that a movement of the lever carrying the
receiver, in one direction, and against the said spring, disconnects the call-circuit
from the main-line, brings in the receiver and secondary circuit of the transmitter,
and at the same time completes the primary local circuit of the transmitter; while
a movement of the said lever in the other direction, and from the reaction of the
said spring cuts out the receiver and secondary circuit of the transmitter, and
restores the call circuit.
Again, the said lever carrying the telephonic receiver, and combined with a
supporting arm therefor, and otherwise constructed, arranged and combined with
the telephonic receiver, and primary and secondary local circuits of the transmitter
and the local circuit of the main line in accordance with either one or both of the
preceding clauses, is provided with fenders or guards constructed and arranged for
an abutment in a manner to limit, at the proper time, the movement of said
carrying lever independent of its contact between its stud or studs or posts and the
contact studs of its supporting arm.
Secondly. An arm or lever is arranged to be moved forward and backward upon
a support which carries a series of studs or posts all insulated therefrom, but
connected with the call and telephonic circuits, and the said arm is linked or
connected to a switching lever or plate but insulated therefrom and it and the said
switching lever are arranged and adapted in such a manner, that a movement of
'

page_text: the said arm in one direction, so operates the said switching lever, as through it to
disconnect the call circuit from the main line, bring in the receiver and secondary
circuit of the transmitter and at the same time to complete the primary local
circuit of the transmitter, while a movement of the said arm in the other direction,
cuts out the receiver and secondary circuit of the transmitter and restores the call
circuit.
Then, again an arm is arranged to be moved forward and backward upon a
support which carries a series of studs or posts all insulated therefrom but
connected with the call and telephonic circuits and the said arm is linked or
connected to a switching lever or plate but insulated therefrom, and it and the said
switching lever are arranged and adapted in such a manner that a movement of
the said arm, in one direction, and, in that direction, against a spring, so operates
the switching lever, as through it to disconnect the call circuit from the main
line, bring in the receiver and secondary circuit of the transmitter and at the same
time complete the primary local circuit of the transmitter, while a movement of
said arm in the other direction, and, in that direction, from a reaction of the
said spring, cuts out the receiver and secondary circuit of the transmitter and
restores the call circuit
Thirdly. In telephonic systems of communication, central offices so termed, are
established, through which, on notification, the necessary electric connections or
circuits for telephonic communications are made, as the same may be requested, as
for instance either between local stations belonging either to the same central office,
or to different central offices, or between different central offices and so on, as well
known.
In all cases, at each central office all the separate local stations and the separate
central offices connected therewith are represented by separate and distinctively
numbered or otherwise marked and designated, signal drops or rather "annunciator
drops," as they are more particularly called
These drops are each arranged and otherwise connected so that when a call is
made, or rather rung in, as it is termed at a central office from another central
office, or from a local station of the several central offices and local stations
represented by the said annunciator drops, the annunciator drop corresponding
thereto will fall or otherwise be so changed in position as to notify the central office
thereof, when said drop is replaced, and the desired connection or circuit for the
telephonic communication is inade, after which on its being finished, a calling or
ringing in, as before is again made, similarly notifying the central office of the fact,
when the drop is again replaced and the electric connection or circuit for telephonic
communication, made as before stated, is broken, all as well known.
This calling or ringing in of a central office heretofore has been accomplished by
means, as for instance a magneto machine, as it is called, which are separate and
distinct from the telephonic switch of each local station or central office, as the case
may be, and by the movement of which the said local station or central office, as
the case may be is placed out of the call circuit and into the telephonic circuit or
vice versa, the central office being called or rung in.
The object of the third part of this invention is to dispense with these said separate
and distinct means such as the magneto machine, for the purpose of calling or
ringing in the central office, as above described, or, in other words, in substance, to
secure by the movement alone of the said switch either from the call to the
telephonic circuit or from the telephonic to the call circuit, the calling or ringing in
and notification of the central office, as above explained.
To this end it consists essentially in the combination with the mechanism
and circuit connections of telephonic switches and instruments as ordinarily or
otherwise suitably arranged, of mechanisn and a circuit connection therefor-to
secure from the passage of the switch from the call to the telephone circuit or
vice-versa a signalling of the central office in accordance therewith, all substantially
as described

page_text: Figures 1 to 7 inclusive relate to part one;
Figures 8 to 15, inclusive to part 2 and
Figures 16 to 22, inclusive to the third part of this invention
Figures 1, 6, 8, and 16, are plan views;
Figures 2, 4, 9, and 17 are side elevations with some parts in vertical section;
Figures 3, 5, and 7, are vertical sections respectively on line 3-3, figure 2;
line 5-5 figure 4, and line 7-7 figure 6;
Figures 10, 11, and 12, are vertical sections respectively on the lines 10-10,
11-11, and 12-12 all of figure 8; drawn to an enlarged scale.
Figures 13, and 14, are plan views in detail drawn to an enlarged scale
Figure 15, is a vertical section on the line 15-15, figure 14.
Figures 18, 20, 21, and 22, are vertical sections respectively on the line 18-18,
figure 16, the line 20-20, figure 18; the line 21-21-6gure 20; and the
line 22-22-figure 17;
Figure 19, is a horizontal section on line 19-19, figure 18;
Diagrams 1 to 5 inclusive, are illustrations of the wires and instruments, and
other parts to make the various electrical circuits required, all as hereinafter fully
explained
A indicates the telephonic transmitter; B the telephonic receiver; C a local
battery; D a magneto machine; E call-bells, and F, an annunicator drop at the
central office, each and all of any of the usual constructions and arrangements of
parts and therefore needing no particular description herein.
This
The receiver D is clamped within a clamping ring G, surrounding its body,
and this ring in turn is secured, as is shown, through an intervening hinge or
joint H in two parts, at right angles to each other, to an arm or lever J.
lever between its two ends at a, is fulcrummed upon an arm or support K,
and thus adapted for a forward and backward swing or movement thereon
This support K is fixed in position in any suitable manner, shown in the
drawings, in two forms; for instance, in Figures 1, 2, 8, and 9, upon an adjustable
standard L, and in Figures 16, 17, and 18, upon a stationary box M, and in both
cases the support K, is jointed thereto with a hinge or joint N, in two parts, all of
which forms no part of this invention so will not be more particularly described.
In the swing of the lever J its part O crosses its support K and either the said
part O, of the lever or the said support for the lever, or both, are provided with
electrically connected contact surfaces or studs or posts shown in figures 1, 2, 3, and
diagram I as consisting of three separate posts, marked with the figures 1, 2, and 3,
respectively, and in the remaining figures and diagrams, as consisting of five
separate posts, three being the same and similarly marked with those just referred
to, and the remaining two with figures 4, and 5, respectively.
In Figures 1 to 5, inclusive and in figures 16, to 21, inclusive, post 1 is carried by
support K, and posts 2, and 3 by lever J one at each side of post 1, and at such
distance from each other and in relation to post 1, that swinging lever J in one
direction brings side post 2, into contact with one side of intermediate post 1, and
the other side post 3, out of contact at the opposite side. thereof, and swinging
lever J in the other and opposite direction, brings side post 3, into contact with one
side of intermediate post 1, and the other side post 2 out of contact at the opposite
side thereof.
In Figures 4 and 5, and 16 to 21, both inclusive post 4 is carried by support K,
and post 5 by lever J and these posts are situated for post 5, to make and be in
contact with post 4 when post 3 makes and is in contact with post 1, and to have
said contact broken when post 3, is out of contact with post 1, and post 2 is in
contact with post 1.
In Figures 6 and 7, post 1, is carried by lever J, and posts 2, 3, 4, and 5 are all
carried by support K; post 2, being at one side and posts 3, 4, and 5, all at the

page_text: other side of post 1, and severally arranged for post 1, when lever is swung in one
direction to make contact with post 2, and be out of contact with posts 3, 4, and 5,
and swung, in the other direction, to make contact with posts 3, 4, and 5, and be
out of contact with post 1.
In Figures 8 to 13, both inclusive all the posts 1, 2, 3, 4, and 5 are carried by
the support K; 2 and 4 are at one side and 3 and 5, are at the other side of post 1,
which is above a horizontal switching plate or lever P of said support, which lever
is linked at Q to lever J, and turns on a fulcrum b of said support.
This switching plate and posts 1, 2, 3, 4 and 5 and their construction and
arrangement will be hereinafter particularly and fully described.
· Posts 1, 2, 3, 4, and 5, are made of metal, or of other material suitable for an
electric conductor, and also for the attachment of an electric conducting wire, and
in their arrangement above described, either upon the lever J, or upon its support K
or upon both, all are insulated therefrom, as for instance with hard unvulcanized
india-rubber or other suitable material, as at d, of the lever J, and at f of the
support, and the switching plate p, and its fulcrum b and link connection Q are
also similarly insulated from lever J at d, and support at f figures 8, 9, 10,
and 13.
The wire connections between these posts 1. 2, 3, 4, and 5, a telephonic receiver B,
a telephonic transmitter A a local battery C, bells E, a magneto machine D, and
ground at Ṛ and at S and main line T running to annunicator drop F at central
office are shown in the several diagrams 1. 2, 3. 4. and 5, and in every case the
electric connection of each post is the same; diagram 5 differs from diagrams 1, 2,
3, and 4 in these respects, that the magneto machine D between the ground
at R and bells E is omitted and another local battery U is shown, the wire
connections of which will be hereinafter explained and the annunciator drop F, at
central office is shown as in the main line T;
These wires consist of a wire A¹ connecting post 1, with main line T which
passes to ground at V, shown only in diagram 5; a wire B³ connecting post 2 with
bells E, and ground at R passing through magneto machine D when that is used;
a wire C³ running from post 3 into and out of both the receiver B and transmitter A
to the ground at S; a wire E³ running from one pole of local battery 1 to and
through primary coil of transmitter and from thence to post 5, which is connected
by a metal plate g, or other electrical conductor of suitable material to post 3, see
figures 5 and 6 particularly, and a wire D' leading from post 4 to other pole of
said local battery C.
These several wire connections between the several posts 1, 2, 3. 4, and 5 and
the receiver B transmitter A, local battery C, bells E, magneto machine D, ground
at R and S, and main line T, are as usual, and from them. First, with post 1 in
contact with post 2, the call circuit is established with the main line that is from
the main line T along wire A¹ in the direction of the arrows, to post 1, and through
said post to and through post 2, and thence by wire B³, in the direction of the
arrows, to the bells E, magneto machine D and ground at R Second, with post 1
in contact with post 3 and post 4. in contact with post 5 see diagrams 2 and 4, or
what is the same thing post 1 in direct contact with posts 3, 4, and 5 see diagram 34
together with the metallic connection g between posts 3 and 5, the telephonic
circuit is established with the main line T, that is from main line T, along wire A¹,
in the direction of the arrows to post 1 and through said post to and through
post 3, and thence by wire C³, in the direction of the arrows, to and through the
receiver B and transmitter A and from thence to the ground at S.
another circuit is established by wire E, from the primary coil of the transmitter
to and through post 5, and from thence through post 4, and wire D', and both poles
of local battery C, and wire E5, with the transmitter A, thus completing the circuit
between the transmitter A, receiver B, and local battery C.
And also
When the call circuit, by bringing post 1 into contact with post 2, is established,
the telephonic and other circuits above described as made at the same time with
said telephonic circuit are broken, and again, when the telephonic and other circuits

page_text: above described as made at the same time with said telephonic circuit are
established by bringing post 1 into contact with post 3, the call circuit is broken,
and either of said two classes of circuits is established, as the case may be by
swinging lever J in the one or the other direction upon its fulcrum a, and these
operations obviously are each capable of being accomplished without removal of
the receiver B from said lever J, or, in other words, from its support, and either
by pressure upon the lever J from the hand of the user, or from the rest of the ear
of the user against the receiver when being used
The lever J carrying the receiver has a spring h, at one end attached to it and at
the other end attached to the support all in a manner for the movement of the
lever J, in the one direction, as herein described, to break the call circuit and
establish the telephone and other circuits, to be against said spring and in the
other direction as herein described, to establish the call circuit and break the
telephonic and other circuits from the reaction of said spring, whereby, as is
apparent all liability of the call circuit being accidently left broken or cut out
when ceasing to use the telephone or it is not being used is obviated absolutely.
In the arrangement of the posts, shown in Figures 1 to 5, inclusive, and in diagrams
1 and 2, relative to the lever J, and its support K either post 2 or 3 as the case
may be, by the described swing of the lever J, is brought into contact with post 1,
whereas in the arrangement of the contact posts shown in Figures 6 and 7, relative
to lever J, and its support K by the described swing of the lever, post 1, is brought
into contact with either post 2 or 3, as the case may be; post 1, in both arrange-
ments being the post connected by wire A¹, to main line T.
The swinging lever J; has a fender or guard Y, projecting therefrom on opposite
sides of its support K, and in position to respectively abut against said support, as the
lever, is swung to make the contacts between the contact posts herein described and
at the times such contacts are made, and thus by such abutinents thereof prevent any
under strain or pressure between the contact posts when contact is made by them
either for the call circuit, or for the telephonic and other circuits herein described.
If desired the lever J baving the receiver B together with the supporting arm K,
therefor may be arranged for the one to have a rectilinear movement upon the
other instead of a swinging movement as has been herein particularly described
and shown.
Again, if desired, the contact posts may be provided with screws, at one end
making the contacts of the posts by reason of which, as is obvious the contact
posts can be readily adjusted to compensate for their wear from use
Lever J, in Figures 6 and 7 is not shown as provided with fenders or guards Y
as above described but obviously it may be provided with them and for the same
operations and purposes
Contact post 5 is directly in line with post 3, and post 4, in line with post 1, as
plainly shown in Figure 5, and for better illustrating the connecting wires,
diagram 2, which is with the posts arranged as in Figures 4 and 5, post 5 is
represented as out of line with post 3 as also post 4 out of line with post 1.
Fenders or guards Y, may be arranged upon the support K, instead of upon the
forward and backward moving lever J to which the telephonic receiver is attached.
The switching plate P, Figures 8 to 15 both inclusive hereinbefore referred to,
is made of metal or of other suitable electric conducting material and it passes
between the posts 2, 3, 4, and 5, and along its two edges, as at w, x, y and z, it is
shaped so that if the lever J, is swung upon its fulcrum a in one direction (the
switching plate P, being operated thereby) the part of said switching plate will
come into contact with the side of post 2, and its other parts to wit, w, y, and x be
placed out of direct contact respectively either with the posts 3, 4, and 5 or with
metallic or other electric conducting plates or surfaces. a³, attached to said posts
as shown, and so that if the lever J, is swung upon its fulcrum in the opposite
direction (the switching plate being operated thereby) the part w, of said switching
plate P, will come into direct contact with the side of post 3, the part y with
the side of post 4 and the part x, with the side of post 5, or in the case of each of

page_text: said posts, as is particularly shown in the drawings, into contact with the metal
plate or surface a³, attached thereto respectively, by riding or passing over the
same, and the part z of said switching plate will be placed out of contact with
post 2.
Post 1, as shown in Figures 8, 9. and 10, has an extension or arm b², of metal or
other suitable electric conducting material which is shaped at its free end, to rest
with a yielding pressure upon, and thus make contact with the upper surface of
the metal switching plate P, when said switching plate is hung upon a fulcrum-
pin b separate from post 1. If post 1 makes the fulcrum, for the switching plate P,
then this extension or arm 62 of post 1 may be dispensed with.
The several wire connections between the several posts 1. 2, 3. 4. and 5, and the
receiver B transmitter A, local battery C bells E magneto machine D, ground at
R and S, and main line T, are as usual, and together with a switching plate of the
construction arrangement and operation shown and described, as to contact between
its parts w x, y, and z, and said posts or metallic plates or surfaces a² connected
therewith, and together with a metal connection, either by the extension or arm b³,
or by the post 1 between said switching plate P and said post 1 establish :-
First. with the switching plate P in contact with post 2, and said switching
plate out of contact with posts 3, 4, and 5, the call circuit with the main line, that
is from main line T, along wire A¹, to post 1 in the direction of the arrows and
thence through post 2, along wire B' and in the direction of the arrows, to the
bells E, magneto machine D, and ground at R, and they establish :-
Second, with the switching plate in contact with posts 3. 4, and 5, or what is the
same thing in contact with the metallic plates or surfaces a", respectively of said
posts and said switching plate in contact with post 3, the telephonic circuit with
the main line T, along wire A¹, in the direction of the arrows to post 1, and
through said post 1, to and through post 3, and thence by wire C³, in the direction
of the arrows to and through the receiver end transmitter to the ground And
also they then establish another circuit by wire E³, from the primary coil of the
transmitter to and through post 5, and from thence by the switching plate P,
through post 4, and wire D, and both poles of local battery C, and wire E³, with
the transmitter A, thus completing the circuit between the transmitter A receiver B,
and local battery C
When by bringing switching plate P, into contact with post 2, the call circuit is
established, the telephonic and other circuits above described as made at the same
time with said telephonic circuit are broken, and again when, by bringing switching
plate P, into the contact described with posts 3, 4, and 5, the telephonic and other
circuits above described as made at the same time with said telephonic circuit are
established the call circuit is broken, and either of these two classes of circuits is
established as the case may be, by swinging the lever J, in the one or the other
direction upon its fulcrum a and through the swing of said lever swinging the
switching plate P, and these operations obviously are each capable of being
accomplished without removal of the receiver from said lever J, or in other words
from its support and either by pressure upon the lever J, from the hand of the user
or from the rest of the ear of the user against the receiver when being used.
The parts wx and y, of the switching plate P, making the electric connections
between said plate and posts 3, 4 and 5, and securing the establishment of the
telephonic and other circuits as has been described are each shaped together with
the metal plates a³ of said posts belonging to them, all as shown, so that contact
will be maintained at or ensured between said parts of the switching plate and
said plates a of the posts until the switching plate has almost or in fact reached
the extreme limit of its swing to break said telephonic or other circuits, the
advantage of which is obvious, in the use of the receiver and transmitter as it
allows the rest of the ear against the receiver to be relieved either accidentally or
intentionally as it and the transmitter are being used without necessarily breaking
the circuit previously established for their being used
A great advantage of the telephonic switch (Figures 8 to 15 inclusive) is in the

page_text: fact that as all the wire connections are made with posts upon the support K, and
with no post or posts upon the swinging lever J, there is no danger of the wires
becoming entangled or interfering in any way with the use of said lever and
again it allows the posts to be boxed or cased thus protecting them against liability
of injury from any cause whatever.
In Figures 10 and 11 d, is a horizontal rod that passes through, and from side
to side of the block f supporting or carrying post 1, and other posts, and also that
passes across and at its middle and cam or eccentric portion f, in contact with the
under side of the extension or finger piece 62 hereinbefore described, and making
the electric connection between said post 1, and the switching plate P. This
eccentric f, and rod d, are arranged to be turned freely within said block f, and
for convenience in turning them the rod d² has at one of its projecting ends a
milled head g², and is shouldered, at both projecting ends, to hold it, as it is turned,
against escape from said block
The eccentric f, is shaped, so that turned in one direction partially around, it
will by working against the under side of the extension 62 lift said extension
sufficiently to break its rest upon and electric connection with said switching
plate P, and also hold it thus lifted as long as said eccentric remains stationary
and in such position relative to its said extension, when, by continuing to turn
the eccentric in the same direction it will allow said extension to drop or move
to its said rest and bearing upon said switching plate, re-establishing electric
connection between said switching plate and post 1, which may be continued so
long as said eccentric then remains in such position relative to said extension.
An eccentric f³, constructed and arranged and operating upon said extension b³,
as above described, plainly permits by a simple turning of it the telephonic
instruments to be at any time, instantly and completely, put out of and into
electric connection thereby providing most efficient and ready means of making
the instruments safe against accidents and casualties during electrical storms and
also at and during such other times as may be desired.
As shown in Figures 16 to 22, both inclusive post 1, which is connected with
main line T has a horizontal spring finger piece or prong 2, which projects from
it, and into position for a horizontal finger piece or prong k³, that is carried by
lever J, as said lever is swung upon its fulcrum to make and break the circuits as
has been described, to pass or slide over and in contact with said finger piece h²
The finger piece 2 of lever J, is part of a metal plate m² connected to a post 6
of the switch, all insulated from the lever, and this post in either position of the
lever has no contact with the posts 1 and 4 of support G.
Post 6 of the lever J (diagram 5) is connected by a wire F6 with one pole of a
local battery U the other pole of which is connected with, the ground at X and
consequently with the finger pieces or prongs h³ k³ of the lever J and its support K
in contact, a circuit is established through main line T local battery U ground
at X, and annunciator drop F in central office, and through its action said
annunciator drop at the central office is made to fall or drop, and thus the central
office is notified and signalled, as usual and needing no more particular description
herein
This contact of the prongs h², k³, respectively of the lever J and support K is
made in either movement of lever and as is plain during the passage of the lever
from the call circuit to the telephone circuits and vice versa, and it secures a
similar signalling of the central office in both cases provided of course the
annunciator drop, after it has dropped in passing from call to telephonic circuit or
vice versa has been replaced.
Heretofore this signalling of the central office has been accomplished with a
magneto machine or other means which are operated, separately and distinctly
from the operation of the telephone lever or switch J while in the arrangement of
contact prongs h², k², just described the movement itself of the lever J alone signals
the central office
Diagram 5 shews a local battery Z separate from the ordinary local battery C

page_text: for making the electric circuit for the intervening switching prongs h³, and le³ of
the lever or switch J and its support K,
This battery U however may be dispensed with, and the connection of post 6,
made by wire with the ordinary local battery C, or again a battery in the main
line may be employed.
Yielding or unyielding contacts for the switch and its support may be used but
yielding contacts obviously are preferable, and again the intermediate electric
circuit connection made as the switch or lever J passes from call to telephone
circuit or vice versa, obviously may be applied to other forms of switches as well
as that herein particularly shown and described and therefore this invention as to
this feature is not to be limited thereto
The ordinary local battery C may be dispensed with in which case posts 4 and 5
would not be required but it is preferable to use it. While the arm or lever J
making the lever as it were for operating the switching plate P, of the telephonic
switch has been herein particularly described and shown as carrying the telephone
receiver, and with manifest advantages and conveniences, it is plain that the
telephone receiver may be removed therefrom and be carried and supported
independently thereof and without in the least degree affecting the operation of
the switching plate P, by and from the movement of the switching lever J upon
its support K.
Therefore it is not intended to limit the use of the switching plate in any
respect to the fact that said lever J as particularly shown and described, does
carry said receiver although as it is obvious it is preferable that it should and for
that reason has been so particularly shown and described.
In Figures 17 and 22, A' is a U-shaped spring dog or catch hung upon an ear-
piece B of lever support K. This spring-catch is arranged so that with post 1
in contact with post 2, its end C (Figure 22,) can and will be interlocked with or
abutted against the inner edge D³, of one fender Y, of the lever J and thus made
to fasten said lever against movement until it, said catch, has been released by
pressing its handle E toward the catch J. The spring F¹, of the catch A5, acts to
hold it engaged as above described and to place it automatically into said engage-
ment when contact is made by post 1 with post 2. The catch engaged obviously
prevents accidental movement of the lever from call to telephonic circuits.
Having thus fully described the said invention as communicated to me by my
foreign Correspondent and the manner of performing the same I wish it understood
that I Claim;—
First An arm J carrying a telephonic receiver and adapted for a forward and
backward movement upon a support K, in combination with the contacts 1, 2 and 3
applied to and arranged upon said arm and support and electrically connected
with the call and transmitter circuits, the latter circuit including the receiver,
substantially as described, whereby by moving said arm in one direction the
receiver and transmitter circuits will be established, and the call circuit broken,
and by moving said arın in the other direction, the receiver and transmitter circuits
will be cut out and the call-circuit established
Second. An arm J carrying a telephonic receiver and adapted for a forward and
back ward movement upon a support K, and provided with a spring h, in combination
with contacts 1. 2. and 3, applied to and arranged on said arm and support and
electrically connected with the call and transmitter circuits, the latter circuit
including the receiver, whereby, by moving said arm in one direction, and against
said spring, the receiver and transmitter circuits will be established, and the call
circuit broken, and by the movement of said arın, from the reaction of said spring,
in the other direction, the receiver and transmitter circuits will be cut out, and the
call circuit established.
Third An arm J carrying a telephonic receiver and adapted for a forward and
backward movement upon a support K, and contacts 1, 2, and 3, applied to and
arranged upon said arm and support, and electrically connected with the call and
transmitter circuits, the latter circuit including the receiver, in combination with

page_text: fenders or guards Y, substantially as described, whereby by moving said arm in
one direction, the receiver and transmitter circuits will be established, and the call
circuit broken, and by moving said arm in the other direction the receiver and
transmitter circuits will be cut out and the call circuit established, and in said
movements of said arm, said fenders or guards will protect said contacts against
undue pressure or strain.
Fourth an arm J carrying a telephonic receiver and adapted for a forward and
backward movement upon a support K, a spring h, and fenders or guards Y, in
combination with contacts 1, 2, and 3, applied to and arranged upon said arm and
support and electrically connected with the call and transmitter circuits, the latter
circuit including the receiver, substantially as described, whereby, by moving said
arm in one direction, and against said spring, the receiver and transmitter circuits
will be established, and the call circuit broken, and by the movement of said arm
from the reaction of said spring in the other direction the receiver and transmitter
circuits will be cut out and the call circuit established, and in said movement of
said arm, said fenders or guards will protect said contacts against undue pressure
or strain
Fifth An arm J carrying a telephonic receiver, and adapted for a forward and
backward movement upon a support K, in combination with contacts 1, 2, 3, 4
and 5 applied to and arranged upon said arm and support and electrically connected
with the call and transmitter circuits, the latter circuit including the receiver, and
with a local battery circuit, substantially as described whereby, by moving said
arm in one direction, the receiver, transmitter and local battery circuits will be
established, and the call circuit broken and by moving said arm in the other
direction the receiver, transmitter and local battery circuits will be cut out, and the
call circuit established.
Sixth An arm J, carrying a telephonic receiver and adapted for a forward and
backward movement upon a support K, and provided with a spring h, in combination
with contacts 1. 2. 3. 4 and 5, applied to and arranged upon said arm and support
and electrically connected with the call and transmitter circuits, the latter circuit
including the receiver, and with a local battery circuit, substantially as described,
whereby by moving said arm in one direction and against said spring, the receiver,
transmitter and local battery circuits will be established, and the call circuit
broken, and by the movement of said arm from the reaction of said spring in the
other direction the receiver transmitter and local battery circuits will be cut out,
and the call circuit established.
Seventh. An arm J carrying a telephonic receiver and adapted for a forward and
backward movement upon a support K and contacts 1, 2, 3, 4, and 5 applied to and
arranged on said arm and supports, and electrically connected with the call and
transmitter circuits, the latter circuit including the receiver and with a local
battery circuit, in combination with fenders or guards Y substantially as described,
whereby by moving said arm in one direction the receiver, transmitter and local
battery circuits will be established, and the call circuit broken, and by moving
said arm in the other direction, the receiver, transmitter and local battery circuits
will be cut out and the call circuit established, and in said movements of said
arm said fenders or guards will protect said contacts against undue pressure or
strain.
Eighth An arm J, carrying a telephonic receiver and adapted for a forward and
backward movement upon a support K, a spring h, and fenders or guards Y, in
combination with contacts 1, 2, 3, 4, and 5 applied to and arranged upon said arm
and support and electrically connected with the call and transmitter circuits, the
latter circuit including the receiver, and with a local battery circuit, substantially
as described, whereby by moving said arm, in one direction and against said spring
the receiver, transmitter and local battery circuits will be established, and the call
circuit broken, and by the movement of said arm from the reaction of said spring
in the other direction the receiver, transmitter, and local battery circuits will be

page_text: cut out, and the call circuit established, and in said movements of said arm said
fenders or guards Y, will protect said contacts against undue pressure or strain.
Ninth An arm J, carrying a telephonic receiver and adapted for a forward and
backward movement upon a support K for said arm, in combination with the
studs 1, 2, and 3 applied to said support and with the switching plate P upon said
support adapted to be operated by said moving arm, and insulated from said arm
and support but electrically connected with stud 1, and said studs 2, and 3, with
the call and transmitter circuits the latter circuit including the receiver but all
insulated from said support, whereby by moving, through said arm J, said switching
plate in one direction, the receiver and transmitter circuits will be established, and
the call circuit broken, and by similarly moving said switching plate in the other
and opposite direction the receiver and transmitter circuits will be cut out and the
call circuit established.
Tenth An arm J, carrying a telephonic receiver, and adapted for a forward and
backward movement upon a support K for said arm and provided with a spring h,
in combination with the studs 1. 2. and 3, applied to said support, and with the
switching plate P, upon said support adapted to be operated by said moving arm
and insulated from said arm and support but electrically connected with stud 1, and
said studs 2 and 3, with the call and transmitter circuits the latter circuit
including the receiver but all insulated from said support, whereby, by moving
through said arm, said switching plate in one direction against said spring, the
receiver and transmitter circuits will be established and the call circuit broken, and
by similarly moving said switching plate in the other and opposite direction from
the reaction of said spring the receiver and transmitter circuits will be cut out and
the call circuit established
Eleventh An arm J, carrying a telephonic receiver, and adapted for a forward
and backward movement upon a support K for said arm J in combination with a
fender or fenders or guards Y, and with studs 1, 2, and 3, applied to said support,
and with the switching plate P upon said support adapted to be operated by said
moving arm, and insulated from said arm and support but electrically connected
with stud 1 and said studs 2, and 3, with the call and transmitter circuits the
latter circuit including the receiver, but all insulated from said support whereby
by, moving through said arm, said switching plate in one direction, the receiver and
transmitter circuits will be established, and the call circuit broken and by similarly
oving said switching plate in the other and opposite direction the receiver and
transmitter circuit will be cut out, and the call circuit established, and in either or
both of said movements, through an abutment of said fender or fenders said studs
and switching plate will be protected against undue pressure or strain.
Twelfth. An arm J carrying a telephonic receiver and adapted for a forward and
backward movement upon a support K, for said arm in combination with the
studs 1, 2, 3, 4 and 5, applied to said support and with the switching plate P,
upon said support adapted to be operated by said moving arm, and insulated from
said arin and support, but electrically connected with stud 1, and said studs 2, and 3
with the call and transmitter circuits the latter circuit including the receiver, and
said studs 4 and 5 connected with the circuit through a local battery but all
insulated from said support whereby by moving, through said arm J said switching
plate in one direction, the receiver, transmitter and local battery circuits will be
established and the call circuit broken, and by similarly moving said switching
plate in the other and opposite direction the receiver and transmitter and local
battery circuits will be cut out and the call circuit established
Thirteenth. An arm J, carrying a telephonic receiver and adapted for a
forward and backward movement upon a support K, for the said arm and
provided with a spring h, in combination with the studs 1, 2, 3, 4 and 5, applied to
Baid support and with the switching plate P, upon said support adapted to be
operated by said moving arm and insulated from said arm and support but
electrically connected with stud 1 and said studs 2 and 3, with the call and

page_text: transmitter circuits the latter circuit including the receiver and said studs 4 and 5
connected with a circuit through a local battery, but all insulated from said support
whereby by moving, through said arm, said switching plate in one direction against
said spring the receiver and transmitter and local battery circuits will be established,
and the call circuit broken, and by similarly moving said switching plate in the
other and opposite direction from the reaction of said spring the receiver and
transmitter and local battery circuits will be cut out and the call circuit
established
Fourteenth. An arm J, carrying receiver, and moving upon a support K, having
electric connected studs 1. 2. an! 3. all substantially as described, in combination
with a switching plate P, electrically connected as described with stud 1 and
constructed at its parts w, and 2, and arranged to be operated by said arm J, and
all so as to make contact with studs 2, and 3, substantially as and for the purpose
described.
Fifteenth. The arm J, carrying receiver and moving on a support K, having
electric connected studs 1, 2, 3, 4, and 5, all substantially as described in
combination with a switching plate P electrically connected as described with
stud 1, and constructed at its parts w, x, y and z, and arranged to be operated by
said arm J. and all so as to make contact with studs 2, 3, 4, and 5, substantially
as, and for the purpose described
Sixteenth. In a telephone switch of suitable construction and electrical
connections to make and break the call and telephone circuits, the combination of
contact pieces arranged as the switch passes from one to the other of said circuits
and in either direction, to establish a circuit and through it to signal substantially
as described for the purpose specified
Seventeenth. A telephone switch, and its support having contacts 1. 2. and 3
said contacts being as usual electrically connected, in combination with prong h² of
said contact 1 and electrically connected prong k², substantially as described for the
purpose specified
Eighteenth A telephone switch having contacts 1, 2, 3, 4, and 5, said contacts
being as usual electrically connected and the contact 4 with a local battery C and
a transmitter in combination with prong h2, of said contact 1 and electrically
connected prong k² substantially as described for the purpose specified
Nineteenth. A telephone switch having contacts 1, 2, and 3, said contacts being
as usual electrically connected in combination with prong h² of contact 1 and
prong electrically connected with a local battery C and ground substantially as
described for the purpose specified.
Twentieth. A telephone switch having contacts 1, 2, 3, 4, and 5 said contacts
being as usual electrically connected, and the contact 4 with a local battery C and
a transmitter in combination with prong h³ of contact 1 and prong, electrically
connected with a local battery U and ground, substantially as described for the
purpose specified.
Twenty first. The catch A5 in combination with lever J and its support K,
substantially as, and for the purpose described.
In witness whereof I the said Henry Harris Lake have hereunto set my
hand and seal this Fifth day of March in the year of Our Lord One thousand
eight hundred and eighty four.
HENRY. H. LAKE (LS.)