IMPROVEMENTS IN AND RELATING TO ELECTRICAL CONDUCTORS OR CABLES CHIEFLY DESIGNED FOR TELEPHONIC PURPOSES
Year: 1883

page_text: LETTERS PATENT to Henry Harris Lake, of the firm of Haseltine, Lake
and Co, Patent Agents, Southampton Buildings, London for an Invention of
"IMPROVEMENTS IN AND RELATING TO ELECTRICAL CONDUCTORS OR CABLES
CHIEFLY DESIGNED FOR TELEPHONIC PURPOSES "-communicated to him from
.
PROVISIONAL SPECIFICATION left by the said Henry Harris Lake at the
Office of the Commissioners of Patents on the 24th March 1883.
HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co, Patent Agents,
Southampton Buildings, London, "IMPROVEMENTS IN AND RELATING TO ELECTRICAL
CONDUCTORS OR CABLES CHIEFLY DESIGNED FOR TELEPHONIC PURPOSES [commu-
nicated to me from abroad by Clément de Cazenave, of Verviers Belgium.]
"
Those who are occupied with telephony have proved that its application is
retarded by the impossibility of establishing telephonic lines consisting of a number
of wires to great distances by reason of the induced currents which are developed
in the wires
The present invention has for its object to obviate the induction between the
wires
In some cases I place what I term an "anti-inductor" upon a telephonic post
of a line of eight wires. This anti-inductor is composed of a metal band (preferably
copper) of say four centimetres wide, one edge of which is directed towards the
wires to facilitate the derivation of the current towards the earth; this derivation
takes place by a wire called a ground wire placed at the lower part of the band
and leading into the earth along the post. To assist the derivation towards the
earth, the edge directed to the wires can be cut or formed with teeth like a saw.
By the employment of this apparatus upon the telephonic posts, the current
induced in one wire from another can be conducted into the ground at each post
in proportion as it tends to develope

page_text: A modified form of the anti-inductor is composed of a metal band (preferably
copper) placed horizontably and three vertical bands rivetted thereto. This apparatus
is connected to the earth by a wire as above described This form of apparatus
presents the advantage of separating the wires from one another by a derivation to
the earth.
The thickness of the bands should be such that they will not be bent by the
pressure of the wind.
The anti-inductor may, if desired, be placed at the point where the wire going
to a subscriber's house leaves the post.
The employment of this apparatus permits the construction of overhead
telephonic lines to great distances without having recourse to a considerable spacing
of the wires. It obviates not only the induction in one wire from another, but.
annuls the influence of atmospheric electric currents which cause so much disturbance
in the telephonic communications.
These apparatuses should be employed at the departure from the post where the
induction commences to manifest itself, in order to confine the range of its influence
and maintain it within the half of the distance between the wires.
The anti-inductor for cables is based upon the same principle of conducting
. towards the earth at intervals the induced current of one line upon another; this
is effected by winding upon each line, separately and upon several centimetres of
its length a metal wire (preferably copper) insulated at that part which comes to
the outside of the cable, and connected to the earth to establish the derivation.
The employment of the anti-inductor for overhead lines and for cables will
permit of establishing telephonic lines to great distances for communicating
between one town and another, and the application of this principle to telegraphic
lines is also advantageous.
The form and construction of the anti-inductor may be modified' in various
manners without departing from the nature of the invention.

page_text: wires. It obviates not only the induction in one wire from another, but annuls
the influence of atmospheric electric currents' which cause so much disturbance in
telephonic communications.
These apparatuses should be employed at the point of departure from the post
where the induction commences to manifest itself, in. order to confine the range of
its influence and maintain it within the half of the distance between the wires
.
The anti-inductor for cables is based upon the same principle of conducting
towards the earth, at intervals, the induced current of one line upon another; this
is effected as shown in Figure 7 by winding upon cach line, separately and upon
several centimetres of its length, a metal wire T (preferably copper) insulated at
that part which comes to the outside of the cable, and connected to the earth to
establish the derivation.
The employment of the anti-inductor for overhead lines and for cables will
permit of establishing telephonic lines to great distances for communicating between
one town and another; and the application of this principle to telegraphic lines is
also advantageous.
The form and construction of the anti-inductor may be modified in various
manners without departing from the nature of this Invention
Having thus fully described the said Invention, as communicated to me by my
foreign Correspondent, and the manner of performing the same, I wish it understood
that I claim :-
First. The " anti-inductor" hereinbefore described, consisting essentially of a
metallic frame, arranged around overhead line-wires without touching the same,
but in close enough proximity thereto to receive the current induced therein, the
said frame being connected with the ground in order to lead the inducted current
to the earth, as set forth.
Second. In an electrical cable, winding for a certain length at irregular intervals
around each insulated wire thereof, an additional metallic wire, the said wire
being in communication with the ground as in the case of overhead lines for the
purpose specified
In witness whereof I the said Henry Harris Lake, have hereunto set my
hand and seal this Twenty fourth day of September in the year of our Lord One
thousand eight hundred and eighty three.
HENRY H. LAKE (L.S.)