Electric Wires.
Year: 1884

page_text: Electric Wires.
I JAMES HART-DAVIES of the firm of Hart & Co Patent Agents of 186 Fleet
Street in the City of London do hereby declare the nature of my said invention
for AN IMPROVED APPARATUS FOR DESTROYING INDUCTION IN ELECTRIC WIRES
(communicated by Kasimir Dembinski Lieutenant of Cavalry of Brussels in the
Kingdom of Belgium) to be as follows:-
The object of this invention as communicated to me by my foreign correspondent
is to completely destroy the induction produced on telegraph wires so as to admit
of telephone wires being placed alongside of them.
This object is effected by using an apparatus consisting of induction bobbins
made up of a wire of one millimetre in diameter covered over and completely
insulated by and from an induction wire of one twelfth of a millimetro in diameter
having a resistance of five hundred ohms. One of these bobbins so made is used
for every pair of wires one of each pair being a telegraph wire the other a
telephone wire which are attached to the terminals on opposite ends of the bobbin
and the currents can pass through the induction wire and issue through the other
terminal on the same ends of the bobbin at which they entered. Thus for a system
of six wires three being telegraph and three telephone wires three of these bobbins
would be used and so on and this anti-induction apparatus would be fitted up at
the two extremities of a line while to each apparatus is supplied one similar
supplementary bobbin to which two earth wires are attached one being for the
telegraph wires on one end of this bobbin the other for the telephone wires on the
other end of this bobbin. Between those two terminals on the end of each bobbin
by which the telephone wires are connected to the said bobbin is fitted a
commutator which connects the said terminals.
The action of this apparatus is as follows. The telegraph wire from a Morse or
other instrument passes to the terminal at one end of a bobbin the current then
passes through the induction wire and emerges through the other terminal at the
same end of this bobbin to proceed to the receiving instrument' issuing again

page_text: therefrom to reach the earth wire through the supplementary bobbin in a similar
manner. The telephone wire starting from the microphone or other instrument.
will pass to the terminal on the other end of this same bobbin and the current will
pass from this terminal through the commutator to the other terminal on this same
end of the bobbin and thus run directly into the microphone or other recipient and
thence into the telephone thereafter passing to the terminal on the supplementary
bobbin through a similar commutator to the other terminal on the same end of this
bobbin and finally to the telephonic earth.
This bobbin therefore is used to destroy the induction produced by the
telegraphic transmission upon the telephonic transmission and it may be used for
currents of any degree of intensity while this system involves but little cost and
the electric energy of the batteries need not be reinforced.

page_text: Electric Wires.
I JAMES HART-DAVIES of the firm of Hart & Co. Patent Agents of 186 Fleet
Street in the City of London do hereby declare the nature of my said invention
for AN IMPROVED APPARATUS FOR DESTROYING INDUCTION IN ELECTRIO WIRES
(communicated by Kasimir Dembinski Lieutenant of Cavalry of Brussels in the
Kingdom of Belgium) and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
The object of this invention as communicated to me by my foreign correspondent
is to completely destroy the induction produced on telegraph wires so as to admit of
telephone wires being placed alongside of them.
This object is effected by using an apparatus consisting of induction bobbins
made up of a wire of one millimetre in diameter covered over and completely
insulated by and from an induction wire of one twelfth of a millimetre in diameter
having a resistance of five hundred ohms which bobbins are made up as aforesaid
in any usual or convenient manner. One of these bobbins so made is used for
every pair of wires one of each pair being a telegraph wire the other being a
telephone wire which wires are attached to the terminals on opposite ends of the
bobbin and the currents pass through the wires of the said bobbin and issue
through other terminals on the same ends of the said bobbin at which the said
currents respectively entered the same. Between those two terminals on the end
of each bobbin by the which the telephone wires are connected to the said bobbin
is fitted a commutator which connects the said terminals for the purpose hereinafter
described.
In Sheet 1 of the accompanying drawing is shewn by way of illustration an
apparatus intended to subserve six wires three of which are telegraph wires and
three are telephone wires and there are therefore three of these bobbins herein-
before described. Taking the six wires that issue out of the commutator X they
are caused to lead the currents successively through the wires of the bobbins that
is to say-wire 1 leads the current through the terminal d of the bobbin A to
emerge through the terminal d' of the said bobbin A-wire 2 leads the current
through the terminal e on the other end of the same bobbin A to emerge through
the terminal e¹ of the said bobbin A-wire 3 leads the current through the
terininal d of the bobbin B to emerge through the terminal d³ of the said
bobbin B-wire 4 leads the current through the terminal e on the other end of
the same bobbin B to emerge through the terminal e³ of the said bobbin B-wire 5
leads the current through the terminal d' of the bobbin C to emerge through the
terminal d³ of the said bobbin C-wire 6 leads the current through the terminal e
on the other end of the same bobbin C to emerge through the terminal of the
said bobbin C. The wires from the terminals del d³ e³ ³ and e³ are directed
towards the post.
In the same manner any other number of wires would be treated in every case
one bobbin being used for each pair of wires as aforesaid and this installation is
fitted up at the two extremities of a line while to each installation or apparatus as

page_text: aforesaid is supplied and fitted one similar supplementary bobbin to which two
earth wires are attached one being for the telegraph wires at one end of this bobbin
the other for the telephone wires at the other end thereof.
In Sheet 2 of the accompanying drawing is shewn the application of this
apparatus and arrangement aforesaid to telegraph and telephone wires placed as
herein before declared in close proximity to each other so that the induction
produced may be destroyed.
Taking one of the aforesaid bobbins A for instance the telegraph wire from a
Morse or other instrument E is led to the terminal d of the said bobbin A the
current then passes through the induction wire thereof and emerges through the
other terminal d of the said bobbin A to proceed to the receiving instrument E
issuing again therefrom to reach the terminal d of the supplementary bobbin D
and thence through the other terminal d' to pass to the earth wire. The telephone
wire starting from the microphone or other transmitter F is led to the terminal e
on the other end of the same bobbin A and the current then passes through the
commutator H to the other terininal e of the said bobbin A and thus runs directly
to the microphone or other receiver F and thence to the telephone thereafter
passing to the terminal e of the supplementary bobbin D through a similar
commutator H' to the other terminal e and finally to the telephonic earth.
These bobbins therefore are used to destroy the induction produced by the
telegraphic transmission upon the telephonic transmission which result is obviously
obtained by the closing of the circuit of the wire by means of the commutator thus
completely relieving the telephone wire of the telegraph induction as is desired.
This apparatus and method or system of procedure as herein before described
may be used for and with currents of any degree of intensity and a great advantage
thereof is that but little cost and expense is involved in applying the same to
existing arrangements and also that the electric energy or power of the batteries
need not therefor be reinforced or increased.
Having now particularly described and ascertained the nature of my 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
1. The induction bobbin constructed and made up of one wire of one millimetre
in diameter and of another wire of one twelfth of a millimetre in diameter
substantially as herein before described.
2. The application to the induction bobbin of a commutator substantially as and
for the purpose hereinbefore described and declared.
3. The method of using one and the same induction bobbin for the passage both
of a telegraph current and of a telephone current substantially as 'herein before
described and set forth.
4. The method of using a supplementary induction bobbin similar to the bobbin
hereinbefore described and claimed through which supplementary bobbin both the
telegraph currents and the telephone currents pass before running to earth
substantially as hereinbefore described and set forth.