Improvements in Telephonic Systems and Apparatus.
Year: 1895

page_text: Date of Application, 25th Apr., 1895
omplete Specification Left, 25th Jan., 1896-Accepted, 29th Feb., 1896
PROVISIONAL SPECIFICATION.
Improvements in Telephonic Systems and Apparatus.
I, JOHN EDWARD KINGSBURY, of 79 Coleman Street, in the City of London,
Manager, (a communication to me from abroad by The Western Electric Company,
of Chicago, Illinois, United States of America,) do hereby declare the nature of
this invention to be as follows:-
This invention relates first, to a system of circuits and apparatus in association
with a common battery or centralized source of electric current for telephone
exchanges by means of which signals are sent from the subscribers station to the
central station, and second to a system of circuits and apparatus in association with
a common battery or centralized source of electric current by means of which
telephonic transmitters at the subscribers station are energised and by means of
which various automatic visual signals or clearing out drops are operated in the
central station at which the subscribers lines terminate. These two features can
be used either together or separately.
It is preferred to employ metallic circuits between the subscribers stations and
the central stations and to extend them through the switch-boards with open
branch terminals at each section thereof and provide them with line annunciators
whose helices are split in the centre to include in its circuit a battery common to a
number of line annunciators.
The apparatus at the subscribers station is so arranged that when the telephone
is on the hook, the circuit is through a call bell and condenser, or through a high
resistance bell alone, and when the telephone is off the hook, the circuit is through
the telephone and transmitter.
The central station apparatus is so arranged that between the two plugs of each
pair is an induction coil, having four windings, two of which are in each loop and
a source of current between the two windings of each loop, and an automatic visual
signal or clearing-out-drop between one helix of the induction coil and the sleeve
of the plug connected in series in each of the two loops. This source of electric
current, which may be a battery, serves to energise the telephonic transmitter at
the subscribers station when one of the loop plugs is inserted in the answering
jack of the circuit, also the subscribers telephonic transmitter on the called line,
when one of the plugs has been inserted in the corresponding jack and the
telephone removed from the hook. It also serves to operate the automatic visual
signals or clearing out drops.
The drawing is a diagram illustrating the connections between a central station
and two subscribers stations. L' and L' represent two metallic circuits extending
from the subscribers stations 1 and 2 to the central station S terminating thereat
in open branch terminals j and j' bridged in between the two sides or conductors a
and b, and a' and b¹ of the circuits L¹ L' and in their line annunciators. When
the telephone t or t¹ is on its hook h or h¹ at the subscribers station, the circuit is
closed through the bell or ', and when the telephone is off its hook, the circuit
is through the transmitter m and telephone (or and t¹). The helices of the
line annunciators N N¹ are split centrally e el aud connected to the battery B.
When the telephone is on its hook, the battery B is practically inoperative as the
circuit is through the high resistance bell alone or , or through the bell I or
and condenser c or c¹ but when the telephone is taken from the hook, the circuit is
through 3 or 31 and the battery B energises the helices of the line annunciators and
causes them to display their signals.

page_text: The operator's circuit is shown at the middle of the diagram. The looping
devices operate as follows: P. and P¹ being the plugs of the same pair which are
connected with each other by cords and fand repeating coil R. Each conductor
has in its circuit a ringing key K K visual siguals or clearing out drops V Vi and
two helices of the repeating coil between which is a common battery A or a source
of electric current common to a number of coils. The operator's telephone is
bridged across one of the loops, the circuit being through the induction coil i and
the condenser r.
The test is made by touching the test-ring of a jack with the tip of plug P¹.
When the line is not in use, no click will be heard in the operator's telephone.
When the line is in use, the circuit will be from earth through battery to back
ring of jack, through plug-ring, at some other section, to front ring of jack and
through drop restoring-coil to earth thereby completing the test circuit. On
touching the front of one of the jacks of this circuit with a plug P' the circuit is
from the front ring to the tip of plug through cord f, ringing key k', repeating
coil R, listening key Y, induction-coil and telephone T to earth, thereby com-
pleting the battery connection through the operators telephone which causes a
click and indicates that the line is in use at some other section of the switchboard.
In this diagram, the operation is as follows: When the telephone is removed
from its hook at either subscriber's station, say 1, the battery B energizes the line
annunciator N, causing it to give a signal, as previously described, the operator
inserts plug P into answering-jack j, thereby permitting current to flow into line L'
from battery A to energize the subscriber's transmitter m. Upon receiving the
number of the subscriber wanted, the operator makes test with the other plug Pl
and if free, inserts it into one of the jacks of the line wanted, presses the ringing
key K causing a current to pass from the generator G through the bell A. During
the continuance of the connection, the transmitters at both subscribers sections are
energized by the battery A, the circuit being through the subscribers lines a and 6
of line Land a' and of line L, transmitters m m³, receivers tt, the clearing
out drops V V₁ and the helices of the induction coil R. When either of the
subscribers replaces his telephone or upon its hook h or ', the circuit is
practically open through the high resistance bell or land the current ceases to
operate the clearing out drop V V' and indicates that their line is not in use.
Dated this 25th day of April 1895.
Improvements in Telephonic Systems and Apparatus.
I, JOHN EDWARD KINGSBURY, of 79 Coleman Street, in the City of London,
Manager (a communication to me from abroad by The Western Electric Company,
of Chicago, Illinois, United States of America,) do hereby declare the nature of
this invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement -
This invention relates first, to a system of circuits and apparatus in association
with a common battery or centralized source of electric current for telephone
exchanges by means of which signals are sent from the subscriber's station to the
central station, and second to a system of circuits and apparatus in association
with a common battery or centralized source of electric current by means of which
telephonic transmitters at the subscriber's station are energised and by means of
which various automatic visual signals or clearing out drops are operated in the
central station at which the subscribers' lines terminate. These two features can
be used either together or separately.
It is preferred to employ metallic circuits between the subscribers' stations and

page_text: the central stations and to extend them through the switch-boards with open branch
terminals at each section thereof and provide them with line aununciators whose
helices are split in the centre to include in their circuit a battery common to a
number of line annunciators.
The apparatus at the subscriber's station is so arranged that when the telephone
is on the hook, the circuit is through a call bell and condenser, or through a high
resistance bell alone, and when the telephone is off the hook, the circuit is through
the telephone and transmitter.
The central station apparatus is so arranged that between the two plugs of each
pair is an induction coil, having four windings, two of which are in each loop and
a source of current between the two windings of each loop, and an autoinatic
visual sigual or clearing-out-drop between one helix of the induction coil and the
sleeve of the plug connected in series in each of the two loops.
:
This source of electric current, which may be a battery, serves to energise the
telephonic transmitter at the subscriber's station when one of the loop plugs is
inserted in the auswering jack of the circuit, also the subscriber's telephonic
transmitter on the called line, when one of the plugs has been inserted in the
corresponding jack and the telephone removed from the hook. It also serves to
operate the automatic visual signals or clearing out drops.
The drawing lodged with the Provisional Specification is a diagram illustrating the
connections between a central station and two subscribers' stations. L'and L' repre-
sent two metallic circuits extending from the subscribers' stations 1 and 2 to the
central station S terminating thereat in open branch terminals; and 1 bridged in
between the two sides or conductors a and b, and a' and 61 of the circuits L'L' and
in their line annunciators. When the telephone t or t' is on its hook h or h¹ at the
subscriber's station, the circuit is closed through the bell or ', and when the
telephone is off its hook, the circuit is through the transmitter m and telephone t
(or ml and 6). The helices of the line annunciators N N' are split centrally eel and
connected to the battery B. When the telephone is on its hook, the battery B is
practically inoperative as the circuit is through the high resistance bell alone 7 or 1',
or through the bell or and condenser c or o¹ but when the telephone is taken
from the hook, the circuit is through 3 or 3' and the battery Benergizes the helices
of the line annunciators and causes them to display their signals.
The operator's circuit is shown at the middle of the diagram. The looping
devices operate as follows:-P and P¹ being the plugs of the same pair which are
connected with each other by cords fand fand repoating coil R. Each conductor
has in its circuit a ringing key K K, visual signals or clearing out drops V V', and
two helices of the repeating coil between which is a common battery A, or a
source of electric current common to a number of coils. The operator's telephone
is bridged across one of the loops, the circuit being through the induction coil i and
the condenser r.
The test is made by touching the test ring of a jack with the tip of plug P'.
When the line is not in use, no click will be heard in the operator's telephone.
When the line is in use, the circuit will be from earth through battery to back ring
of jack, through plug ring, at some other section, to front ring of jack and through
drop restoring coil to earth thereby completing the test circuit. On touching the
front of one of the jacks of this circuit with a plug P1 the circuit is from the front
ring to the tip of plug through cord ¹, ringing key k', repeating coil R, listening
key Y, induction coil and telephone T to earth, thereby completing the battery
connection through the operator's telephone which causes a click and indicates that
the line is in use at some other section of the switchboard.
In this diagram, the operation is as follows :-When the telephone is removed
from its book at either subscriber's station, say 1', the battery B energizes the line
annunciator N, causing it to give a signal, as previously described, the operator
inserts plug P into answering-jack; thereby permitting current to flow into line L'
from battery A to energize the subscriber's transmitter m. Upon receiving the
number of the subscriber wanted, the operator makes test with the other plug P¹

page_text: and if free, inserts it into one of the jacks of the line wanted, presses the ringing
key Kcausing a current to pass from the generator G through the bell . During
the continuance of the connection, the transmitters at both subscriber's sections
are energized by the battery A, the circuit being through the subscriber's lines a
and 6 of line L₁ and a¹ and b¹ of line L, transmitters m m³, receivers tt, the
clearing out drops V V₁ and the helices of the induction coil K. When either of
the subscriber's replaces his telephone or t¹ upon its hook or h¹, the circuit is
practically open through the high resistance bellor and the current
ceases to operate the clearing out drop V V₁ and indicates that their line is not
in use.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The combination of a source of current on a circuit common to two or more
subscribers an annunciator and a high resistance bell or a condensor and bell.
2. The combination of an induction or repeating coil having four windings two
of which are in each loop and a source of current between the windings of each
loop.
3. A source of current common to two or more subscribers whereby visual
signals or clearing out drops for cach subscriber are operated independently of
each other.
4. A source of current common to two or more subscribers whereby their
telephonic circuits are energized and visual signals or clearing out drops for each
subscriber are operated independently of each other.
5. The combination with a circuit connecting two subscribers of two (or two
sets of) visual signals or clearing out drops and means whereby each subscriber
can operate one signal (or set of signals) but not the other.
6. Telephonic apparatus substantially as described and shewn in the drawings.
Dated this 24th day of January 1896.
J. E. KINGSBURY.