An Improved Method of Reducing Electrical Induction on Telephone and other Circuits.
Year: 1893

page_text: Date of Application, 21st Mar., 1893
Complete Specification Left, 2nd Aug., 1893-Accepted, 2nd Sept., 1893
PROVISIONAL SPECIFICATION.
An Improved Method of Reducing Electrical Induction on Telephone
and other Circuits.
GEORGE EDWIN FLETCHER, of "The Homestead" Cale Green Stockport in
the County of Chester, Electrical Enger,horoby declare the nature of this
invention to be as follows:―
The object is to prevent the receiving end of a telephonic or like circuit from
responding to any inductive influences except from a transmitter coupled to the
circuit.
The invention consists essentially in the use of condensation and induction to
convey the required signals from the transmitter to the receiver and an inducer
and condenser under my invention is made up of alternate plates of a conducting
material, separated by plates of insulating material, interplaced at intervals or
regularly with additional inductive & condensing plates, one set of plates is
coupled to the line wire and earth and another set to earth and the receiving
instrument.
Dated this 20th day of March 1893.
GEO, EDWIN FLETCHER.
COMPLETE SPECIFICATION.
An Improved Method of Reducing Electrical Induction on Telephone
and other Circuits.
GEORGE EDWIN FLETCHER of The Homestead, Cale Green, Stockport
in the County of Chester, Electrical Engineer 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 object is to prevent the receiving end of a telephonic or like circuit from
responding to any inductive influences except from a transmitter coupled to the
circuit.
The invention consists essentially in the use of condensation and induction to
convey the required signals from the transmitter to the receiver, and an inducer
and condenser under my invention is male up of alternate plates of a conducting
material separated by plates of insulating material interplaced at intervals or
regularly with additional inductive and condensing plates. One set of plates is
coupled to the line wire and earth and another set to earth and the receiving
instrument.
In order that my invention may be readily understood I have appended a sheet
of drawings containing two diagrams illustrative of apparatus used in carrying my
invention into effect.
In Fig. 1a represents the line circuit passing say through ordinary induction
coils as usual in connection with transmitters.,, represent condenser plates
separated by insulating material. represents a third plate or set of condensing
surfaces interspaced between and b, and insulated therefrom. The line wire a is
coupled to the plate e which is connected to earth at d. The plates bare con-
nected by a wire e to one receiver and the plates by a wire to another
receiver. The receivers are connected by a wire y which is led to earth at h.
Extraneous induced currents passing through the line wire are not of sufficient
intensity to act on the condenser plates connected to the receivers.

page_text: In Fig. 2 the main line wire a is coupled to one set of condenser surfaces b',
whilst the other set of plates is coupled to the receiver which is connected to
earth at h. The intermediate condensing surface is lead to earth at d. The
intermediate plates act as a damper to prevent the low tension extraneous currents
from influencing the condenser plates connected to the receiver.
Instead of flat surfaces, coils may be used composed either of strips of metal or
wire.
usual way.
any
The transmitters are connected to the main wire in
Having now particularly described and ascertained the nature of my said inven
tion, and in what manner the same is to be perforined, I declare that what 1
claim is :-
First. Conveying telephonic or telegraphic signals from the main wire to the
receivers by means of condensation and induction, substantially in the manner and
for the purpose set forth.
Second. The combination of three sets of condensing surfaces with a main wire,
a receiver, and earth, substantially as set forth.
Dated this the day at Imm 1982
Per pro J. T. KING,
J. Johnson,
Agent.