Improvements in Anti-induction Devices.
Year: 1891

page_text: Date of Application, 4th Nov., 1891
Complete Specification Left, 4th Aug., 1892-Accepted, 24th Sept., 1892
PROVISIONAL SPECIFICATION.
Improvements in Anti-induction Devices.
I, JULES CERPAUX, of 3 Rue d'Artois, Brussels in the Kingdom of Belgium
Electrician, do hereby declare the nature of this invention to be as follows:-
The object of my invention is to condense and conduct to earth induction
currents, which from various causes become formed on telephonic lines. The
longer a telephonic line is extended, the more chance there is of having induced
currents which sometimes hinder communication. So much so is this the case that
on lines of great length the employment of a double line is necessary.
My apparatus for condensing these induction currents allows of communications
at a great distance by means of a single wire.
The apparatus. itself is very simple; it is composed of leaves or sheets of lead
and pieces of fabric, placed alternately one beside the other i.e. each sheet of lead
being between two pieces of fabric and each piece of fabric between two leaves or
sheets of lead.
These sheets of lead and pieces of fabric are held together between two pieces of
wood or other suitable material and the pressure is regulated according to the
electrical resistance to be obtained.
The apparatus may be fitted on legs in a box by means for example, of screws.
The wires conducting the currents from the terminals to the armature are
connected to two sheets of lead on opposite sides of the condenser.
The sheets of fabric are subjected to the following preparation:
They are steeped in spirit of soap containing a saturated solution of chloride of
sodium and as soon as they are well impregnated they are withdrawn and dried by
a very hot fire. The apparatus thus constructed is now ready to work.
The regulation is effected by screwing the fly nuts on the bolts which hold the
plates of wood together more or less tightly so regulating the pressure of the sheets
of lead and fabric.
The apparatus above described is not traversed by the direct and full strength of
the current of the line of wire and it only condenses the exterior currents, that is to
say the induced currents.
Dated this 4th day of November 1891.
JULES
CERPAUX,
By Brewer & Son,
Agents.
COMPLETE SPECIFICATION.
Improvements in Anti-induction Devices.
I, JULES CERPAUX, of 3 Rue d'Artois, Brussels, in the Kingdom of Belgium,
Electrican, do hereby declare the nature of this invention, and in what manner
the same is to be performed, to be particularly described in and by the following
statement:-
The object of my invention is to condense and to conduct to the earth induction
currents, which, from various causes, become formed on telephonic lines. The
longer a telephonic line is extended, the more chance there is of the formation of
these induced currents, which sometimes hinder communication, and so much is
this the case that on lines of great length, the employment of a double wire is
necessary.

page_text: My apparatus for condensing these induction currents allows of communications
at a great distance by a single wire.
My invention will be readily understood by describing same with reference to the
accompanying drawings on which
Fig. 1 represents a single set of apparatus constructed according to my invention
in an enclosing case or box, which latter is shewn in section.
Fig. 2 is a vertical cross section through the centre of same.
Fig. 3 shews a case containing three sets of apparatus, and their connections with
the wires, drawn to a smaller scale than the previous figures.
Figs. 4 and 5 represent respectively a telegraphic and telephonic station, and a
telephonic station serving the same line.
The apparatus itself is very simple. Each apparatus as aforesaid at Figs. 1 and 2
is composed of sheets of lead A and of pieces of fabric B placed one on the other
alternately, that is to say, each piece of cloth is between two sheets of lead and the
lead between two cloths. The leaves thus arranged are compressed more or less
strongly, according to the electric resistance to be obtained, by being pressed
between two plates of hard wood or other suitable material C and D by means of
two bolts E E.
The apparatus is mounted and held in a suitable box by the clamps F F F F.
The wires G and H conducting the currents from the terminals to the armature are
connected to two sheets of lead, and as shewn in Figs. 1 and 2, the currents follow
the course indicated by the arrows. The pieces of fabric, previous to use, are
steeped in spirit of soap containing in solution chloride of sodium to saturation, then
when thoroughly impregnated they are withdrawn and dried quickly by means of a
hot iron.
The apparatus thus constructed is ready for operation. The regulation of the
pressure between the lead and fabric sheets is effected by turning more or less
strongly the thumbscrews II of the bolts E E.
The installation of the apparatus is shewn at Fig. 3 which represents a tele-
graphic and telephonic line of 4 wires. A box J supposed to contain three sets of
apparatus similar to the set shewn at Figs. 1 and 2 is shewn fixed on a post; on the
outside of the box there are six terminals, three connected to the earth by means of
wires marked 4, 5, and 6, the three others connected to the line wires marked 1, 2, 3.
Thus installed, the induction currents which are formed in the wires 1, 2, and 3, pass
by means of the wires 7, 8, and 9 into the apparatus, and from thence are conducted
to the earth by the wires 4, 5, and 6. The direct current of the line of wire does.
not pass through the apparatus, however strong it may be, the apparatus only
conducts the exterior currents, that is to say, the currents of induction.
The Figs. 4 and 5 represent a telegraphic and telephonic station connected with
a telephonic station by the wire marked 3 of Fig. 3. A commutator K permits
the sending of the current to the telephone or to the telegraphic apparatus.
Fig. 5 shews the apparatus constructed according to my invention connected with
a telephone, the wire of entry L being united to the transmitter of the telephone
and the exit wire M to the earth wire N.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:-
1. In an apparatus serving to condense the induction currents which are formed
on telephonic lines, the arrangement of sheets of lead alternating with sheets of
fabric previously steeped in spirits of soap saturated with chloride of sodium, and
capable of being tightened or compressed more or less strongly, according to the
electrical resistance to be obtained, by means of bolts or equivalent therefor,
between plates of wood or other suitable material, substantially as described with
reference to the accompanying drawings.
2. In an apparatus serving to condense the induction currents of telephonic

page_text: wires, the employment of sheets of fabric steeped in spirit of soap holding in
solution chloride of sodium in saturation and subsequently dried, all substantially as
described and specified and with the object indicated.
Dated this 4th day of August 1892.
BREWER & SON,
Agents.