Year: 1886

page_text: I, CHARLES DENTON ABEL of No. 28 Southampton Buildings, Chaucery Lane
in the County of Middlesex, Consulting Engineer and Patent Agent do hereby
declare the nature of this invention to be as follows:-
This invention relates to an improved construction of that description of Volta-
Inductors in which the conductors, instead of being coiled round a central core of
soft iron, are surrounded by iron in tubular form, as described by Dr. Werner
Siemens in the year 1881. Heretofore the construction of such Inductors
presented difficulties on account of the necessity of building up the tubular iron
covering of insulated iron wires or pieces of sheet iron, in order to avoid the loss
of power due to induced currents that would otherwise become dispersed in the
mass of iron.
The present improvements in the construction of such Volta-Inductors consist
mainly in twisting insulated copper wires of any desired number into cable form,
and after drying and soaking them in insulating compound, covering the same with
lead; this is then wound round with iron wire or ribbon in such manner that the
separate coils and layers of coils are insulated from each other by means of
insulating material. Of the cable thus constructed a suitable length is then
wound upon a drum or is formed into an annulus, and the insulated conducting
wires are divided into two groups, proportioned according to the increased
strength of current required. The wires of the one group are coupled together
in parallel arc, and those of the other in series, whereby the increase or decrease
of tension by the current will be obtained, and at the same time the section of the
conductor will be rendered proportionate to the strength of current.
According to another modification instead of winding iron wire or ribbon upon
the insulated conducting cable of copper wire, the latter is wound upon a frame,
and the long straight sides thereof are then surrounded with circular or rect-
angular pieces of sheet iron having a central hole formed therein corresponding to
the section of the cable, and being then cut through diametrically or diagonally,

page_text: so as to be fitted round the cable. These sheet metal plates are varnished or
covered with paper on one side and are applied to the cable closely one upon the
other, but so that the division line of each plate lies at right angles to those of the
contiguous plates.
In either of the above arrangements the wires of both ends of the cable are led
separately to terminals so arranged that at any time they may be combined in
such manner as to produce the required proportion of tension between the primary
and secondary currents.
With Volta-Inductors that are only to be used in dry localities and in which
the tension-differences are not very great, the cables of insulated copper wires need
not be soaked in insulating compound or covered with lead as described.

page_text: I, CHARLES DENTON ABEL of No. 28 Southampton Buildings, Chancery Lane
in the County of Middlesex, Consulting Engineer and Patent Agent 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:-
This invention relates to an improved construction of that description of Volta-
Inductors, in which the conductors, instead of being coiled round a central core of
soft iron, are surrounded by iron in tubular form, as described by Dr. Werner
Siemens in the year 1881. Heretofore the construction of such Inductors
presented difficulties on account of the necessity of building up the tubular iron
covering of insulated iron wires or pieces of sheet iron, in order to avoid the loss
of power due to induced currents that would otherwise become dispersed in the
mass of iron. The present improvements in the construction of such Volta-
Inductors consist mainly in twisting insulated copper wires of any desired number
into cable form, and after drying and soaking them in insulating compound,
covering the same with lead. This is then wound round with irou wire or ribbon
in such manner that the separate coils and layers of coils are insulated from
each other by means of insulating material. Of the cable thus constructed a
suitable length is then wound upon a drum or is formed into an annulus, and the
insulated conducting wires are divided into two groups proportioned according to
the increased strength of current required. The wires of the one group are
coupled together in parallel arc, and those of the other in series, whereby the
increase or decrease of tension of the current will be obtained, and at the same
time the section of the conductor will be rendered proportionate to the strength
of current.
According to another modification instead of winding iron wire or ribbon upon
the insulated conducting cable of copper wire, the latter is wound upon a frame,
and the long straight sides thereof are then surrounded with circular or rectangular
pieces of sheet iron having a central hole formed therein corresponding to the
section of the cable, and being then cut through diametrically or diagonally, so as
to be fitted round the cable. These sheet metal plates are varnished or covered
with paper on one side and are applied to the cable closely one upon the other,
but so that the division line of each plate lies at right angles to those of the
contiguous plates.
In either of the above arrangements the wires of both ends of the cable are led
separately to terminals so arranged that at any time they may be combined in
such manner as to produce the required proportion of tension between the primary
and secondary currents.
With Volta-Inductors that are only to be used in dry localities and in which the
tension differences are not very great, the cables of insulated copper wires need not
be soaked in insulating compound or covered with lead as described.

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 Volta-Inductors tubularly surrounded with iron, the use of cables of
insulated wires and their connections, as herein described.
2. Covering the cables referred to in the preceding claim with lead for ensuring
better insulation of their wires.
3. Covering the cables above referred to with iron wire or plate for strength-
ening the induction.
4. Covering the cables such as are above referred to with iron plates slit so as
to pass over them.