Year: 1887

page_text: Date of Application, 15th Jan., 1887
Complete Left, 14th Oct., 1887
Complete Accepted, 15th Nov., 1887
I, ALFRED ROSLING BENNETT, of 90 George Street, Edinburgh, Telegraph
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention consists in the use of electrical condensers in lieu of the resistances
described in the provisional specification filed with my application for Patent No. 493
dated January 12th 1887.
Wherever in that specification and its drawings, a resistance is set forth and figured
1 substitute an electrical condenser.
The condensers may be of the ordinary type as is well understood by electricians,
or they may be of the kind known as phonophores.
The methods of connecting the wires and telephonic and switching instruments
remain as set forth and figured in the specification aforesaid.
In lieu of resistancos variable at will at stations A and B, I employ condensers the
capacities of which may be varied at will, or a combination of resistances variable at
will and condensers variable at will.
The two methods of resistances and condensers may be combined with satisfactory
results. That is to say, resistances may be employed at station A and condensers at
station B.
Dad this ņaustranth day of Jonna 1907
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow,
Agents.

page_text: I, ALFRED ROSLING BENNETT of 904 George Street Edinburgh, Telegraph
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 :-
My invention consists in the use of electrical condensers in lieu of or in combination
with the resistances described in the Specification filed under my application for
Patent No. 493 of 1887.
The condensers may be of the ordinary type as is well understood by electricians,
or they may be of the special type known as phonopores.
The condensers are preferably, but not necessarily, arranged so that their capacities
may be varied at will, as is well understood by electricians. When employed in
combination with resistances, the resistances may likewise be capable of being
varied at will.
The methods of arranging the wires, and the telephonic and switching apparatus
used in connection therewith, remain substantially as set forth in my before mentioned
Specification. Whenever, according to that Specification, a resistance is employed, I,
according to the present invention, use a condenser, or a condenser in combination
with a resistance.
Figures 1 to 5 represent the arrangements which I find most advantageous to
employ; T, T, T3, T, being the telephones or switching apparatus; R', R³, R³, R*, the
resistances; C¹, C2, C3, (the condensers or phonopores, and Y, Z, the wires con-
necting the two stations. In figures 4 and 5, 1 R, R, R, represent four additional
resistances. Other combinations of the condensers with resistances are possible, those
figured representing only the best methods of working the invention.
These combinations of condensers with resistances apply equally to the developments
necessary when the stations are connected by four or more wires, as described and
figured in the Specification filed under my application for Patent No. 493 of 1887.
The capacity of each condenser may be from to 1 microfarads, and the resistances
may each be equal to from 1000 to 3000 ohms, but both the capacities of the
condensers and the resistances may be varied within wide limits and I do not confine a
myself to any spacific capacity or resistance.
The arrangements for call signalling between T¹ and T4, and T2 and T3³, remain as
described in the Specification filed under my application for Patent No. 493 of 1887,
but when the methods depicted in Figures 1, 2, and 5 are adopted, the indicators
at and T require to be of a more sensitive type than those ordinarily employed in a
telephone exchange work.

page_text: Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I claim is :-
. 1. In telephonic apparatus of the kind described in the Specification filed under the
application for Letters Patent No. 493 of 1887 the employment of condensers in lieu
of resistances substantially as herein set forth.
2. In telephonic apparatus of the kind described in the Specification filed under the
application for Letters Patent No. 493 of 1887 the employment of condensers in
conjunction with resistances in lieu of resistances merely substantially as herein set
forth.