Year: 1887

page_text: Date of Application, 17th May, 1887.
Specification Accepted, 12th July, 1887.
I, Alfred JuliUS BOULT of 323 High Holborn, in the County of Middlesex,
M.I.M.E., do hereby declare the nature of this invention and in what inanner the same
is to be performed, to be particularly described and ascertained in and by the
following statement :-
This invention relates to a reading telegraph which, can be independently
utilized to synchronously convey or transmit the electrical impulses imparted by the
manipulation of the keys of an instrument at one extremity of a main line circuit, to
a similar instrument located at the other extremity of the line.
When this organization of apparatus is used in connection with a printing
telegraph, or any suitable receiver, which sends the message in readable form, each
instrument or transmitter at both ends of the line circuit is suitably electrically
connected with such local receiver, so that, by manipulation of the keys of the trans-
mitter at one end of the line, the circuit is closed from constant battery, and the
electrical impulse imparted synchronously and simultaneously actuates the local
receiver, then passes over the line through distant transmitter which is partly
inactive, to its local receiver, and then to ground.
The object of this invention is to furnish an instrument of this class which will
be simple and effective in operation, easy of manipulation, durable in use and capable
of being used independently, as a reading telegraph, or, by certain electrical circuit
connections with local, receivers, can be adapted to synchronously operate either or
both of such latter instruments at different extremities of the line circuit, as may
be desired.
This invention embraces the following essential and important features viz:
A series of metallic keys carrying the desired letters or characters, are suitably
mounted upon a key-board on the top of the cylindrical casing of the instrument, so
that the depression or detent of any one of them will cause the contact of one of a

page_text: series of retracting springs, charged from a conveniently situated constant battery
with another of a series of upwardly projecting metallic springs connected at
their lower ends with a system of circularly arranged conducting segments
corresponding in number and relative situation to the number of keys of the key-
board; thereby closing the circuit from battery and conducting the impulse or
current through the segments to a rotating brush arm rigidly keyed to a central
revolving indicator shaft, driven by electro motor and carrying another external
parallel arm at its upper end arranged in line with the brush arm inside the casing,
and pointing to the corresponding character of the key-board, as indicated by the
contact brush, on the segments.
These segments are secured upon the top of a vertically adjustable cross bar, which
rests upon an under supporting flange formed integral with the cylindrical casing and
has two lugs projecting through slots in the sides of said casing; the object of this
construction being to allow the segments and their super-incumbent springs to be
normally put in contact with the retracting springs actively charged.
When the current passes through the inner brush arm attached to indicator shaft,
it is conducted through said shaft to another stationary contact brush arm fixed to
the side of the casing, and passes on over the line circuit to the stationary metallic
brush arm of the transmittor located at other end of line, up through central indicator
shaft, along rotating brush arm; and, the segments and super-incumbent springs
being raised up against retracting springs, the current passes through the springs
(they all being in contact and the brush arm rotating in contact therewith) out down
to a suitable switch, the contact lever of which is properly adjusted, thus the current
traverses through said switch, and up around the transmitter into an electro-magnet
which is located in proximity to soft iron disc also rigidly keyed to indicator shaft,
said magnet having the converted lower pole brought around in line and above the
upper pole, the disc will in its revolution, rotate through the central line between
said poles, and the current previously described as having energized the magnet,
causes the attraction of said disc thereby stopping the rotation of indicator shaft,
with the two parallel arms attached thereto, respectively, at the segment and key
corresponding to the key depressed at other end of line.
This current then escapes from magnet by a second wire which connects with
switch, the lever of which being properly pointed, allows the current to pass there-
through on to ground, or, said current may be utilized to operate the local receiver by
suitable switch and wire connections.
This movement as described, is synchronal and under the control of the key of the
transmitting apparatus, and each separate letter is indicated by a single pulsation of the
electric current of a determinate and uniform length, the motion of the indicator
shaft is arrested when the electro magnet is in circuit, and the rotating external
indicator arm enables operator to read message, or the same impulse which stops the
indicator arm, causes the receiver to record such message.
Each key, retracting spring, contact spring, and segment corresponds to a letter
or character of the key-board and the release of any of said keys breaks autmatically
the line circuit.
This invention consists further in certain details of construction, arrangement and
combination of parts which will be more fully and accurately described hereinafter,
and the specific points of novelty in which will be designated in the appended
claims.
Referring to the accompanying drawings:
Figure 1 is a perspective view of the cylindrical enclosing case for this improved
transmitter, showing the upper end of the revolving central shaft, its external
indicating arm, the adjusting screw therefor, the series of keys arranged in a circular
manner upon the removable lid or top, and communicating by their stems with the
interior; the system of wires piercing the sides of said casing and attached to each
and every retracting spring, and the two lugs projecting through a slot in the casing
and their respective catches or clips for holding the lugs at the upper ends of the
slots.

page_text: Figures 2 and 3, are central vertical sections through two instruments complete,
located at different ends of the line circuit, showing the construction and arrange-
ment of the devices within the cylindrical casing, the gearing and shaft of a suitable
motor for driving the central shaft, the switches for cutting the instruments in and
out of the circuit, and the line of the circuit shown by arrows from a suitable constant
battery to the other instrument at extremity of line.
Figure 4 is a central vertical section partly in perspective of one of the transmitters
on an enlarged scale, showing the series of keys on the outside of the top, their
stems piercing the ends of retracting springs, the contact springs secured to the
series of segments corresponding to the number and situation of the keys, the
vertically adjustable cross-bar, the projecting lugs, their catches or clips, the supporting
flange, the slide bars for the removable segments, the central rotating shaft suitably
mounted therein, its two parallel arms, the rotating disc, and electro-magnet for
locking said shaft by means of the current received over the line from a separate
instrument.
Figure 5 is a top plan view of cylindrical enclosing casing with parts broken away
to show the interior construction.
Figure 6 is a detail view in elevation of one of the projecting lugs of the vertically
adjustable flange and its clip or securing catch.
Like letters of reference inark the same parts in all the figures of the drawings:
Referring to the drawings by letters
A, is a cylindrical casing designed to hold the interior mechanism, constructed of
suitable size and material (made preferably of some durable and ornamental wood)
having a removable lid B, suitable base D, and made centrally separable as shown in
figures 2 and 3, the flange or rib C, of the lower portion A³, being secured to
flange C, of the top portion A" by screws a, a.
The lower portion of this casing is designed to hold the electro motor and gearing
for driving the central shaft; and the top portion is the receptacle for the devices
shown in figure 4.
The lid or top B, is provided with a series of small peripheral or circularly arranged
apertures, corresponding to the number of keys intended to be used. In these holes
or apertures are inserted the stems of the series of keys E, E, shown in figure 1,
the said apertures being sufficiently large to allow of a vertical play or movement of
the keys.
Centrally in this lid B, is formed a circular opening 6, through which projects the
central shaft G.
It will be understood that the apertures formed in the top of the casing are of
just a sufficient distance from the circular opening b, to admit of the free rotary
movement of the indicator arm attached to the projecting end of the central shaft,
without impinging against the keys E, E, carrying the desired letters or characters.
Immediately below the flange of the lid B, is a circular row of small holes corre-
sponding in number and location to the number of retracting springs of the
keys E, E.
Through each of said holes passes one of the small wires a³, a¹, connecting at one
end to the line of the battery and at the other is secured to one of the retracting
springs E. (See Figures 2 and 3) c, c, designate two slots of suitable length and shape
cut through the sides of the portion A", of the casing which serves as supports for the
ends of the lugs of a vertically adjustable cross bar F, resting in its normal position
on the supporting flange or lip F, formed on the inside of casing A, and secured,
when raised by the pivoted clips d, d, on the outside of casing, which clips engage and
hold the projecting lugs d', d, of said flange, as shown clearly in figures 2, 3, and 4.
This cross-bar F, is also provided with a circular opening e, through which the
shaft G extends.
H, H, H, are a series of metallic conducting segments of the form shown having
the line or surface el, inclined and running from the upper plane e", to the lower
parallel plane el, the object of this construction being to present an inclined contact
surface which will be free from dust &c.

page_text: These segments are of a suitable number corresponding to the number of keys E, E,
and arranged and secured in circular order upon a suitable hard rubber ring or
base H. Each segment is insulated from the next adjacent segment, the space
between each being filled with an inexpensive and durable insulating material (not
shown).
Upon the plane e¹¹, of each of said segments H, H, is fastened by a screw f, one of
the metallic davit shaped contact springs E", E", which extends upwardly to within
a distance, determined by the length of the slots c, c, of one of the retracting
springs, E', E, thus it will be obvious that when the cross bar F, is elevated and
fastened at the top of slots c, c, by clips d, d, the springs E", E", will be normally
in contact with springs E', E.
The springs E El, are of conducting metal of great elasticity, and of the form
shown, and are each secured directly above its respective contact springs E", by
suitable screws or rivets, to the casing A, which as before stated, is of non-conducting
material. Near the forward ends of each of said springs E', is a small eye through
which passes the rod f', of the stem g, of key E.
Each of the keys E, E, consists of a circular top or button, the stem g, the collar
g', formed near the lower end, and the rod f³, loosely passing through an eye in its
respective retracting spring, and of the required length to engage and intercept the
rotation of the brush arm-H", when its respective key is depressed: this
construction of key is designed both to allow its retracting spring to return it
to an upright position after it has been once depressed, the collar g', pre-
venting it from being retracted too far, and at the same time admits of the
removal of the lid B, the rods f¹; all slipping easily from the eyes in their respective
springs E¹.
The vertical shaft G, is made of suitable conducting metal, provided at its lower
end with a small bevel gear G¹, and formed at its upper end with screw-threads and
shoulder as shown in figure 4.
G", indicates the external indicating arm provided at its inner end with a screw
threaded perforation (not shown) through which passes the screw threaded end of
vertical shaft G; this arin being jammed tightly up against the shoulder of shaft, by
a nut H
a
H", is the interior brush arm which is rigidly secured on the same side of shaft G,
and parallel with arm G", by means of a collar h¹, and a jam-nut h", having
screwed shank 11. Thus the two arms G", and H", are kept exactly and rigidly
parallel with each other, one indicating the letter or key of the key-board, and the
other its corresponding segment.
Should these arms inadvertently get out of line, they can be removed and properly
re-adjusted by the jam-nuts Hand L", as before described.
Hi, is a stationary brush arm secured at one end to the portion A', of the casing
and provided at other end with a metallic brush which is constantly in contact with
shaft G.
I, designates a thin soft metal disc, or armature mounted in between the collars, i, i³,
of the shaft G, just below the flange F, and when the shaft is rotated, revolves
centrally in the magnetic field of the poles I', I", of the electro-magnet J.
The magnet J, is of the ordinary construction secured on flange C, and having the
pole I", converted as shown, brought around the side and parallel to the height of the
said magnet, up directly above the pole I', thereof; thus when the disc I, is revolving
and the magnet is in circuit it passes centrally in the magnetic field of the poles I'
and I, and is mutually attracted by both of said poles, thereby stopping the rotation
of shaft G, the object of which will be understood hereinafter.
1
The magnet J, of instrument 01 is energized by the circuit which has passed
through instrument O, over line P', and through the instrument O' in converse order,
and then along wires a¹ and p', switch point of short wire p¹¹, point o¹¹, wires p" and
of figure 3; the magnet be de-energized by the release of the respective key
depressed, the circuit is completed, the path, being connected with ground by
wire p, and switch, as clearly explained in the operation hereinafter. Thus it will be

page_text: understood that the magnet J is not in circuit in but one instrument, that being the
receiving instrument. Conversely if the magnet J of instrument O, were in circuit,
the position of the parts of instrument O would have to be arranged similar to those
of instrument O¹, (as shown in figure 3,) and the arrangement of parts of instru-
ment O' would then necessarily occupy similar positions to those of instrument O,
shown in figure 2. Therefore, it will be obvious, from the preceding and the
explanation of the operation hereinafter, that the instruments illustrated in figures 2
and 3, are when used independently as reading telegraphs capable of being used
alternately as transmitters and receivers.
K, K, K, are three vertical slide rods or guides secured on the inside of casing A,
and substantially semi-circular in cross-section two of which are shown in figure 5;
they fit in the semi-circular recesses on the sides of the segments to prevent the rotary
movement of the central shaft G, from dislodging or displacing the relative positions
of the said segments.
In figures 2 and 3 as before stated, are placed two of my instruments, each of the
construction herein before described, situated respectively at each end of the line as
shown, the instruments being designed for use independently and alternately as
reading telegraphs, the instrument O, as illustrated, being a local transmitter, and 0¹
serving substantially as a receiver at extremity of line circuit.
Now to preclude the possibility of any error or misunderstanding, we will
suppose that the operator desires to manipulate the keys of the local transmitter, O,
to send a message over the line circuit to the instrument O¹, located at the other end
thereof.
O designates any suitable constant battery connected by wire to the pivoted
switch lever 01, and o, o¹, and o", are three points of the switch P. P is a suitable
insulated wire connecting the point o with wire j¹, of magnet J, p¹ is a similar
wire connecting at one end to point o¹, and at the other to the series of wires a¹, a¹,
of the retracting springs E¹. These wires may be for convenience arranged in the
manner shown in Figs. 2, 3, and 5, which illustrate the lead wires a¹, a', converging
in a suitable cable at the side of casing A and suitably connected to wire p²; p is
a wire secured at one end to point o", and at the other end to magnet J. p is a
short wire connecting points o¹, o¹¹. P¹, is the line wire connecting the two
stationary brush arms H¹, at each end of the line. 9, is a wire connecting the
battery o¹, with ground, and q', a wire connecting switch lever 0111, at other end
with ground, as hown in figure 3.
11
It will be understood that these circuits and connections as above explained are
used merely when the transmitters are used independently as a reading telegraph.
When the transmitters are used in conjunction with their respective local
receivers, the location of battery, switches, cut-outs, electrical connections &c.
are differently arranged and operated.
However such arrangement will not be described or claimed herein, as such
appurtenances, together with an improved receiver or electrical type-writer will form
the subject matter of another application.
The operation of this invention is as follows:
When operator at transmitter O, desires to send message to operator at receiving
instrument O', the switch lever 01, of instrument O, is first pointed to point o
which allows current from battery to flow up through wires p', and a' a', to all of the
retracting springs E' E', then operator at instrument 01, elevates and secures
the lugs of the cross bars F, to height of slots c, c, by catches d, d, thereby placing
the springs E, normally in contact with retracting springs E', as shown in figure 3,
and points switch lever O to point o; then the instruments are in proper position
to perform their respective work.
The operator at O, now successively and respectively depresses the keys E, E, which
carry the desired letters, characters, and punctuation which compose the message.
Suppose for instance, that the key shown depressed in figure 2, is the first one
touched by operator, then as shown, it causes the contact of one of the retracting
springs E, with a spring E", closes the circuit from battery O", through switch

page_text: lever O point o¹, wire p¹, and wire a¹; stops the rotation of arm H", as explained
hereinafter and is returned to its normal raised position by virtue of the retracting
agency of spring E', when pressure of finger is released.
Now, the circuit as before stated being closed, the current passes through spring E
to the corresponding segment H, the brush arm I being arrested in its rotation by
the rod f, of the particular key depressed, opposite to the segment corresponding to
said key, and the said current is communicated by this particular segment H, which
corresponds to the key depressed, to the said rotating arm H", on through shaft G,
to stationary contact brush arm H, and then over the line P¹, as shown by arrows
in figures 2 and 3, down to the other stationary contact brush arm H,
instrument O¹, at extremity of line.
of
Now, the vertically adjustable cross bar F, being raised and secured in the slots,
putting springs E¹, E", of instrument O', in contact, the current previously described
as having entered the brush arm H is conducted up through central shaft G,
across arm H", to segment H, springs E and E¹, through wires a¹ p¹ to point o¹,
then through short wire to point o", up through wire p", in the direction of arrows
around through wire j, to magnet J, to ground through wire ', energizing said
magnet to attract and stop rotation of disc armature I, thereby stopping revolution of
shaft G, with its arms Hand G", respectively at the key and segment of instru-
ment O, that corresponds to the first key depressed in figure 2, and finally passes to
ground by the electrical connections described hereinafter.
The magnet is de-energized by release of the finger pressure upon the respective key
depressed and the shaft is allowed to again rotate, the wire conducting the escaping
current over to wire p, point o, through switch lever Ou, to wire q', to ground, or
said current may be by certain electrical connections and switches (not shown in this
application as aforesaid) utilized to actuate any suitable receiver connected with the
instrument O¹. Thus the operation is continued until the desired message is com-
pletely transmitted.
It will be understood that by reversing the arrangement of switches P, P, and the
vertically adjustable cross-bars F, F, the instrument 0¹, can be used to similarly
transmit over line to transmitter O.
Again it will be obvious that, in the event of the instruments herein before
described being either used independently or in connection with receivers, by means
of a suitable intermediate switch station, they may be located and operated, one
at any number of extremities of a line circuit and can be readily, easily or separately
connected with each other so as to transmit to any number of points as may be
desired.
Furthermore, the key shown black in figure 1 is designed to be used as a blank or
spacing key both when this invention is used independently or in conjunction with
receivers.
The arrangement of the battery, electrical connections switches, &c. can be suitably
and conveniently changed to meet requirements, provided the depression of any one
of the keys closes the circuit from battery or magneto-generator, and arrests the
rotation of the indicator shaft and consequently their trailing arms, in the manner
before described.
Having now particularly described and ascertained the nature of the said invention
as communicated to me by my foreign correspondent, and in what manner the same
is to be performed, I declare that what I claim is :-
1st. The combination of two instruments, respectively located, each, at an extremity
of a line circuit, as shown, and consisting each essentially, of a series of circuit-
closing keys, having elongated stems which engage and intercept the rotation of a
revolving contact brush arm when a key is depressed; a series of normally charged
retracting springs corresponding in number and relative situation to the series of keys
and adapted to make contact with a series of vertically adjustable segments; a series
of segments arranged to be normally in or out of contact with the retracting springs
and corresponding in number and relative situation thereto; a central shaft revolving

page_text: in unison with the shaft of the other instrument, and provided respectively with an
exterior indicating arm, an interior brush arm, normally in contact with the segments,
and an armature disc mounted rigidly upon the said central shaft, and projecting in
the center of the magnetic field of an electro-magnet; an electro-magnet in circuit
with the source of electricity at the other end of the line; and a suitable device, as
shown for electrically connecting the rotating shaft with the line circuit; the whole
being arranged to operate as set forth, with two sources of electricity respectively at
each end of the line; the switches; and the electrical connections whereby the
successive and separate electric pulsations transmitted from either extremity of the
line circuit are received and indicated at the other extremity, as specified.
2nd. The combination of a suitable source of electricity, the retracting springs,
the wire connecting each of said springs with the switch, a three-point switch having
its lever in circuit with the battery, & one of its points in circuit with all of the
retracting springs, and the circuit closing keys provided each with an elongated stem,
as specified.
'
3rd. The combination of the series of keys, each having inwardly projecting stem
provided with collar and extension rod, the retracting springs having the forward
ends provided with eyes for reception of the extension rods of the keys, and the
contact springs arranged below said retracting springs, corresponding in number and
relative situation thereto as set forth.
4th. The combination of the keys, retracting springs and contact springs, arranged
and constructed as described with the system of circularly arranged insulated
segments corresponding in number to the keys, and each having one of the contact
springs secured thereto, as set forth.
5th. The combination of the series of insulated segments arranged as shown, and
their super-incumbent springs, with the vertically adjustable cross bar; whereby the
segments and contact springs may be elevated and said contact springs placed
normally in contact with retracting springs, substantially as set forth.
6th. The combination of the centrally separable cylindrical enclosing case, having
the slots and pivoted catches on the sides thereof, as shown, the vertically adjustable
cross-bar supporting the series of segments, provided with end lugs which project
through said slots, and the inner circular flange formed integral with the casing and
supporting the cross-bar supporting the said series of magnets in its normal position,
as described.
7th. The combination of the circuit closing keys, the retracting springs, and the
vertically adjustable contact springs and insulated segments, with the central
revolving shafts provided respectively with external indicating arm, and the internal
contact brush-arm, both adjustably mounted on said central shaft substantially as
described.
8th. The combination of the vertically adjustable segments and contact springs,
with the central revolving shaft, and the rotating brush-arm mounted thereon and
adapted to rotate in contact with said segments, substantially as set forth.
9th. The combination of the series of keys mounted in the removable lid of the
cylindrical casing, and having the stems as shown provided with collars, and extension
rods piercing the ends of the retracting springs and of sufficient length to intercept
the rotation of inner contact brush-arm when a key is depressed, with the retracting
springs, the vertically adjustable insulated segments carrying contact springs and
the inner brush arm mounted rigidly on the central rotating shaft, substantially as
described.
10th. The combination of the vertically adjustable segments, and their respective
super-incumbent springs, with the retracting springs, the series of keys having stems
and collars, as shown, and provided with extension rods piercing ends of retracting
springs and of sufficient length to intercept the rotation of the inner brush-arm when
a key is depressed, the external indicating arm mounted adjustably on upper end of
central shaft, and the inner rotating contact brush-arm, substantially as set forth.
11th. The combination of the series of circuit closing keys suitably mounted in
removable lid or top of cylindrical casing, and having the stems and collars as shown,

page_text: and provided with extension rods piercing the ends of retracting springs and of
sufficient length to intercept the rotation of inner rotating brush arm adjustably
mounted on the central revolving shaft, as set forth.
12th. The means such as described for rendering the segments and their super-
incumbent springs vertically adjustable, which consists of the cross bar supporting
said segments provided with end lugs which project through slots of the required size
in sides of casing, and the pivoted thumb-catches for holding said lugs at the upper
end of said slots, as described.
13th. The combination of the revolving central shaft, the casing, the keys having
elongated stems provided with collars as shown, the external indicating arm, and the
inner rotating contact brush arm as set forth.
14th. The combination of the central rotating shaft with the armature disc rigidly
keyed thereon and revolving centrally in its rotation between the poles of a magnet,
the electro-magnet secured upon the diaphragm of the casing and having the poles
thereof arranged in line and in proximity to each other, and a suitable source of
electricity and electrical connections for energizing and de-energizing said magnet, as
set forth.
15th. The contact segments such as shown and described, each formed of suitable
conducting material, insulated from the adjacent segments, and having an inclined
contact surface as shown; said segments being arranged relatively with reference to
their respective keys, in circular order upon a vertically adjustable flange in com-
bination with the vertically adjustable supporting cross bar, the retracting springs,
the circuit closing keys and the circuit, as shown and described.
16th. The combination of the circuit closing keys and their respective retracting
and contact springs, and the vertically adjustable segments with a suitable constant
battery, separately connected with each and every retracting spring as set forth.
17th. The combination of a constant battery, with the wires a¹, a¹, arranged as
described, the switches P, P, and the retracting springs and keys for closing the
circuit as set forth.
18th. The combination of the vertically adjustable cross bar, and the super-
incumbent segments of the casing as described with the vertical guide-rods; whereby
such mechanism is retained in its proper position as set forth.
19th. The combination of the battery, switch and the wires connecting each
retracting spring with the line from battery with the circuit closing keys,
the retracting and contact springs, and the vertically adjustable segments as
described.
20th. The combination of the vertical rotating shaft, the external indicating arm,
the inner brush arm, the arunature disc, with the means such as shown and described
for stopping the rotation of said shaft by the depression of any of the circuit closing
keys of the key-board, with its respective arms at the respective segments and key
corresponding to the key depressed, and the electro-magnet having poles arranged as
shown and set forth.
21st. The combination of the vertically adjustable segments, the contact and
retracting springs, and the circuit closing keys with the central revolving shaft, the
contact and indicating arms, the armature disc, the electro-magnet having the poles
arranged as shown, the stationary brush arm fixed to casing and normally in contact
with lower end of central shaft, the line circuit, the switches, electrical connections,
and a suitable battery, as set forth.
22nd. The combination of the central vertical revolving shaft, the collars i, 1, and
the disc armature 1', adapted to be attracted by a suitable electro-magnet having
electrical connections the stationary brush arm, connecting the central shaft with the
line and the line circuit whereby said shaft is stopped and released, at the desired
time as set forth.
23rd. The combination of the shaft G, arms H" and G", with the segments H, H,
and keys E, E, the battery and line circuit as set forth.
24th. The combination of the keys each having a stem g, collar g' and rod f", of
the necessary length with the arm H", secured to shaft G, and the rotating central

page_text: shaft, the retracting spring; the vertically adjustable segments and the circuit as set
forth.
25th. The combination of the battery 01 the switch lever 0111, points o¹, o¹, o¹¹,
wires p, p, p, and a¹, a', with the retracting springs E', and the keys E, E, as shown
and described.
26th. The combination of a suitable constant battery having switch, switch points,
switch lever and suitable wire connections with retracting springs, with the circuit
closing keys, the retracting springs, contact springs, insulated segments, contact
brush arm, external indicating arm, connecting the central shaft with the line, the
central vertical rotating shaft, the stationary brush arm, and the line circuit as set
forth.
27th. The combination of the vertically adjustable segments adapted to receive the
current communicated by the contact and retracting springs through depression of
the keys of the instrument with the rotating contact brush arm and the line as set
forth.
28th. The combination of the vertically adjustable segments adapted to receive
current from retracting springs through their respective contact springs communicated
by the depression of the keys of the instrument, with the external indicating arm, the
rotary contact brush arm, the line, the armature disc, and the electro-magnet having
poles arranged as shown and described.
29th. The combination of the electro-magnet J, having poles I', I", and a suitable
line and ground connections with the armature disc I, mounted on central revolving
shaft, the central rotating shaft provided with the arm G" and the circuit closing
key-board as set forth.
30th. The combination of the electro-magnet J, having poles I¹, I", arranged as
shown, with the disc armature 1 and shaft G the arms G" and keys E, E, the
wires j,j, and the circuit connections as set forth.
31st. The combination of the electro-magnet J, having poles I, I", as shown,
the disc armature 1 the shaft G the arms G and H" and the circuit and connections
as set forth.
32nd. The combination of the electro-magnet J having the poles I' I", as shown,
the disc armature I, the shaft G, carrying said disc armature, the arms G₁₁, and H",
the vertically adjustable segments, the contact springs, having the poles I, I, as
shown, the disc armature I, the shaft G, carrying said disc armature, the arm G",
and H, the vertically adjustable segments, the contact springs the retracting
springs, the keys E, E, the wires a¹, a¹, the circuit connections therefor, and the
switch, as set forth.
33rd. The combination of the shaft G carrying disc I, and arms G" and H" rigidly
keyed thereon, with a suitable gearing mounted upon the shaft of a motor for rotating
said shaft as set forth.
Dated th: 17th
1007
W. P. THOMPSON & BOULT,
Agents.