Year: 1898

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a
I, RICHARD DAVID SANDERS, of Hartfield House, Eastbourne, in the County of
Sussex, Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to the manufacture of wire by electro-deposition.
According to my Patents Nos. 7960 of 1891 and 12382 of 1892 I form the spiral
metallic surface upon which I deposit the metal to form the wire by cutting
screw thread upon the surface of a cylinder and exposing to the electrolytic action
a portion of such thread according to the nature of the wire I wish to produce.
According to my Patent No. 13931 of 1893 I obtain the metallic surface by wind-
ing a wire at the bottom of a screw thread cut or formed in a cylinder of glass
or other non-conducting material.
Now according to the present invention I removeably wind a round wire upon a
mandrel or cylinder constructed substantially as described in the specifications of
my said former patents in lieu of the metallic surfaces therein described so that
both the foundation wire and the deposited metal can be removed together.
This arrangement has the advantage of dispensing with all the corners of the
depositing surface which in practice I have found to cause irregular forms of
deposits.
My present arrangement has the further advantage of enabling a continuous
contact-maker to make contact with every turn of wire notwithstanding the wire
being a spiral, and without the contact maker having to jump from turn to turn
of the spiral as the cylinder revolves.
When the current is caused to flow from the anode to the foundation wire on the
cylinder the copper deposits round each turn of wire, the section of the deposit
being approximately that of a half circle whereby the deposit increases very rapidly
on the area exposed to the electrolytic action and the maximum effective area upon
which the deposit is made in relation to the area of the cylinder is therefore
obtained.

page_text: manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
This invention relates to the manufacture of wire by electro-deposition.
According to my Patents Nos. 7960 of 1891 and 12382 of 1892 I form the spiral
metallic surface upon which I deposit the metal to form the wire by cutting a
screw thread upon the surface of a cylinder and exposing to the electrolytic action
a portion of such thread according to the nature of the wire I wish to produce.
According to my Patent No. 13931 of 1893 I obtain the metallic surface by wind-
ing a wire at the bottom of a screw thread cut or formed in a cylinder of glass
or other non-conducting material.
Now according to the present invention I removably wind a round, oval, semi-
circular or other suitably shaped wire upon a mandrel or cylinder constructed sub-
stantially as described in the Specification of my Patent No. 12382 of 1892 in lieu
of the metallic surfaces therein described, so that both the foundation wire and
the deposited metal can be removed together.
This arrangement has the advantage of dispensing with all the points and
corners of the depositing surface which in practice I have found to cause irregular
forms of deposits and interfere with the removal of the deposited wire from the
cylinders.
My present arrangement has the further advantage of enabling a continuous
contact-maker to make contact with every turn of wire notwithstanding the wire
being a spiral, and without the contact-maker having to jump from turn to turn
of the spiral as the cylinder revolves which is necessary when the foundation wire
is placed at the bottom of the deep grooves shewn in my former patents.
To enable my invention to be fully understood I will describe the same by refer-
ence to the accompanying drawing, in which:
Figuro 1 is a section; and,
-
Figure 2 is a plan of a part of a cylinder for carrying out my invention shewing.
a round foundation wire removeably wound upon the surface of the cylinder.
Figures 3 and 4 are similar views to Figures 1 and 2 but shewing the founda-
tion wire wound in a shallow spiral groove formed on the surface of the cylinder.
Figures 5 and 6 are a section and plan respectively of a part of a cylinder
similar to that illustrated in Figures 3 and 4 but shewing the metal deposited on
the foundation wire:
Figure 7 is a cross section on the line 7-7 Figure 2; and
Figure 8 a cross section on the line 8-8 Figure 6.
Similar letters in all the figures represent similar or corresponding parts.
a represents a metal cylinder covered on its outer and inner surfaces b and c
with vulcanite or other suitable non-conducting material; or instead of using a
combined cylinder, as described, the cylinder may be made of glass, porcelain or
like material as described in my former patents.
d is the foundation wire which as shewn in Figures 1 and 2 may be coiled on
the surface of the cylinder or, as shewn in Figures 3 and 4, into a spiral groove e
formed in the surface of the cylinder, the upper surface of the foundation wire
in either case projecting above the surface of the cylinder.
ff represent the contact makers which are shewn in Figures 2, 4 and 7 as
resting upon the foundation wire d and in Figures 6 and 8 upon the deposited
wire ; these contact makers at g rest upon the conducting wire and can move
upon or be attached to the said wire. i represents a portion of the tank in which
the cylinder works.
By this arrangement it will be seen that the contact makers f can make con-
stant contact with every turn of the wire on the cylinders notwithstanding the
same being spiral, the contact maker not having as heretofore to jump from turn
to turn of the spiral as the cylinder revolves. Any number of contact makers
may be placed on the foundation wire, according to the number of turns on the
cylinder.
"
When the current flows from the anode to the foundation wire d on the cylinder,

page_text: the copper deposits round each turn of the wire d as shewn at j in Figures 5, 6
and 8, the section of the deposit being as shewn approximately that of a half
circle, whereby the deposit increases very rapidly on the rapidly increasing area
exposed to the electrolytic action, and the maximum effective area upon which
the deposit is made in relation to the area of the cylinder, is therefore obtained
and becomes greater than the area of the surface of the cylinder itself.
It will be seen by reference to Figures 5 and 6 that the deposit has reached the
largest section the cylinder is capable of holding and the deposited wire j is
ready to be removed with the foundation wire d from the cylinder. The foun-
lation wire can either be left in the deposited wire or may be removed therefrom
to be rewound upon the cylinder.
Although in the drawing the wire d is represented as being of round section, it
is to be understood that it may be of oval, semicircular or other suitable section.
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 the manufacture of wire by electro-deposition a cylinder having remove-
ably wound thereon, either on its surface or in a shallow groove in its surface, a
round, oval, semi-circular or other suitably shaped wire in such a manner that the
said wire always projects above the surface of the cylinder, substantially as, and
for the purpose, described.
2. In the manufacture of wire by electro-deposition the combination with the
cylinder having a foundation wire wound thereon as described in Claim 1, of
contact-makers adapted to always rest upon the said foundation wire or upon the
metal deposited upon the foundation wire, substantially as described.
3. Wire manufactured by electrolysis on a foundation wire removeably wound
on a cylinder, as described in Claim 1, such manufactured wire being approxi-
mately semicircular in cross section, substantially as described.
TX
021
1
1 1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.