Improvements in the Manufacture of Drawn or Rolled Metallically Coated Metal Articles.
Year: 1890

page_text: Date of Application, 17th Jan., 1890-Accepted, 22nd Feb., 1890
חה זתומם
Improvements in the Manufacture of Drawn or Rolled Metallically
Coated Metal Articles.
I, WILLIAM ARTHUR THOMS, Electrician, of 4 New Court, Carey Street in the
County of Middlesex, 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 :-
The chief object of this invention is to produce compound wires suitable for electric
conduction in incandescent lamps. For this purpose I employ, as the core of the
wire, steel or iron, or alloys of the same, and for an outer covering, or for plating the
same, platinum, gold, aluminium, or other incorrodible metals, or alloys of such
metals.
In carrying out my invention, for example, for the production of conducting wires
for incandescent lamps, I take a length of iron wire (say No. 20 standard wire gauge),
and carefully clean it to remove all traces of oxidation therefrom-If acids be used for
this purpose, the wire must be washed in water to remove the acid, and I then coat
the wire in any well known manner with some metal or alloy (say tin or gold), which
will prevent oxidation during the process of working, and will also ensure the union
of the incorrodible coating or plating metal with the core during the working.
The wire thus prepared with the protecting coating, I insert in a tube of platinum,
and secure it at one end to the core. I then submit the length of platinum
covered wire to the well known operation of drawing, by which means the com-
ponent parts are drawn out to the required length, and compacted together.
press,
The platinum tube for coating the wire I may produce as follows:-I take a piece
of platinum of any desired size and thickness, and put it in a hydraulic or other
which will be provided with a bolster and punch. As the punch descends through
the block of platinum in the bolster, the tube will be formed around it. The punch
is then taken out of the press, and can be used as a triblet for drawing the platinum
down to the required thickness, preparatory to its being placed on the prepared core.
Between each two or three drawings, the compound wire should be annealed,
and this operation should be carried out with the greatest care.
I have found that the annealing can be satisfactorily effected by placing the wire
in a box charged with a mixture of pulverized charcoal and lime, and then subjecting
it to a white heat, and allowing it to cool down gradually.
Instead of shaping the covering metal or envelope as described, before applying
it to the core, the envelope may be made from a strip of metal lapped or wound
around the prepared core, its lapped edges being welded or otherwise secured
together, or it may be produced in any other well known manner.
The above described mode of combining incorrodible metals with the baser metals,
may be advantageously used in the manufacture of ribbons suitable for lightning
conductors, and for plates to be used in electric batteries, a rolling pressure being
applied to the compound, in place of, or in addition to, the drawing operation above
mentioned.
It will be evident that instead of a solid core of steel or other wire, a hollow core
may be used, and that the said hollow core may, if desired, be lined, as well as
externally covered, with platinum or other incorrodible metal, in a manner similar to
that above explained.
Having now particularly described and ascertained the nature of my, said Inven-
tion and what manner the same is to be performed, I declare that what I
claim is :-
In the manufacture of drawn or rolled metallically coated metal articles, the
preparing of the same fuhall
11

page_text: of tin, gold, or other non-oxidizable metal as described, for preventing the oxidation
of the core metal during the process of working, and to increase the cohesion of the
core with the metal employed to form the covering or envelope for the core.
Dated this 17th day of January 1890.
NEWTON & SON,
Agents for the Applicant.