An Improved Mode of Connecting the Parts of a Telephone Apparatus.
Year: 1895

page_text: Date of Application, 2nd Apr., 1895-Accepted, 20th July, 18:5
COMPLETE SPECIFICATION.
An Improved Mode of Connecting the Parts of a Telephone
Apparatus.
A communication from PARNELL RABBIDGE, of Double Bay, near Sydney, in
the Colony of New South Wales, Electrician.
I, ALFRED JULIUS BOULT, of 323 High Holborn, in the County of Middlesex,
Chartered Patent Agent, 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:—
The telephonic apparatus usually consists of five parts, namely, the call, trans-
mitter, receiver, battery and switching appliances whereby the necessary parts are
switched in and out of circuit as required.
Up to the present time this switching appliance, has been usually constructed so
as to automatically switch the call apparatus into the circuit whilst the battery and
transmitter-receiver are switched out of circuit, when the receiver is hung on a hook
that operates the switch.
The object of this invention is, first;-
To dispense with the mechanical automatic switch appliance and to arrange the
circuit so that the transmitter-receiver, and battery shall remain constantly in the
line circuit.
Secondly, to arrange the call circuit whereby two trembling bells, (one at each
station) can be used and made to call at the same time.
To secure the first object of this invention the batteries at each station are
connected to a simple pole reverser or commutator whereby the poles of either
battery can be reversed when it is required to use the telephone. By this means
the two batteries are arranged so as to oppose each other when the telephones
are not in use, and are brought into action by reversing the poles at one station
only, in such a manner, that when the switch is operated at one station the two
batteries are brought into action in series to each other. To secure the second
object, the bell or call is connected in a parallel or shunt circuit to the transmitter
and receiver with one end of the call circuit connected permanently whilst the other
end may be broken automatically so as to cut the call out of circuit as required.
By this means two trembling bells may be made to act at the same time, one ut
each station. When the battery is switched into circuit the calls at both stations
will continue to ring until the operator at either end shall automatically cut the
call out of circuit (as for instance by lifting the receiver to his ear), when both the
calls immediately cease to ring; thus, the ceasing of the ring at A station will shew
that some person is attending at B station.
In the accompanying drawings;-
Fig. 1 shews the old style or system as used at the present time.
Fig. 2 shews this invention applied to both ends of a line, while,
Fig. 3 shews the arrangement at one end only on a larger scale.
In Figure 1 the receiver is shewn hung on the end of the lever which constitutes
the mechanical switch above referred to, the position being, that the receiver,
transmitter and battery are switched out of circuit while the bell is in circuit. In
the improved arrangement shewn in Figure 2, two stations A and B are shewn, the
arrangements of the apparatus at the two stations being identical.

page_text: The current will pass from the battery C, through the conductor D, through
the commutator or pole reverser E, through the conductor F to the ring 9 of the
receiver G, and from thence through the transmitter H to line J. When the
ring is hung on the hook k of the call K (so as to form metallic contact therewith)
a portion of the current will pass by shunt. circuit through the call K to line J,
thus causing the bell or call to sound.
In Fig. 2 the commutators or pole reversers E are shewn in the same position at
both ends, and consequently the batteries C are in opposition and no current will
flow, but if the commutator E at the station 'B be placed-in the position shewn in
Fig. 3, the batteries will be brought into action in series to each other, and the bells
or calls at both the stations A and B will be caused to sound or ring, and will
continue so to ring or sound until one or other of the receivers G is removed from
its hook k, when both calls will cease thus indicating that some person is in
attendance at the telephone.
Having now particularly described and ascertained the nature of, the said inven-
tion, 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.;-
1. In telephone circuits placing a commutator or pole-reverser between the
battery and the receiver and transmitter whereby the current may be caused to flow
from either the positive or negative pole of the battery as described for the purpose
set forth.
2. In combination a telephone line that is connected at both ends to similar poles
of the batteries whereby two positive or two negative poles are in opposition a
telephonic instrument at each end of the line and a commutator or pole reverser at
each end of the line whereby the poles of the battery at either end may be reversed
and the batteries brought into action in series to each other as and for the purposes
herein specified.
3. The improved mode of connecting and disconnecting the call in telephone
circuits consisting essentially of providing two conductors one of which is permanent
and will make a circuit through the receiver and transmitter to line while the
second one such as will pass through the call, as a shunt to the receiver and
transmitter to line but may be broken automatically when required at any inter-
mediate point such as g-k as and for the purposes set forth.
4. In telephone circuits arranging the connections so that the transmitter and
receiver shall be placed in and permanently kept in metallic circuit with the line
while at the same time the bell or call apparatus may be brought into shunt
circuit to them by means of a suitable metallic connection as and for the purposes
herein specified.
5. Making the connections in a telephone circuit in a manner such that the
current shall pass from the battery through the receiver and transmitter and thence
to line while at the same time by placing the receiver and transınitter in a certain
position a portion of the current shall be shunted so as to pass through the call and
thence to line as and for the purposes set forth.
Dated this 2nd day of April 1895.
BOULT & WADE,
Agents for the Applicant.