Improvements in or connected with Rolled Gold Plate.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in or connected with Rolled Gold Plate.
I, AUGUSTE DESIRE PENNELLIER, of No. 56, Gray's Inn Road, in the County
of London, Gold and Silver Refiner, do hereby declare the nature of this invention
to be as follows:-
This invention relates to improvements in or connected with rolled gold plate.
According to the method of manufacture at present adopted, rolled gold plate
the like covered
consists of a base plate of copper, copper alloy or
with a gold leaf or a sheet of gold of a suitable thickness, the same being
pressed together, by heavy hydraulic pressure, or the gold is, in some cases,
sweated on to the base plate.
When the covering of gold thus obtained is of good quality, say, for example,
22 carat gold, it is necessarily extremely thin, and when to some extent worn,
its colour is affected whilst it is liable to become speedily worn through, and
the object of the present invention is to render gold plate more durable than
heretofore, and also to improve the appearance thereof.
In carrying the invention into effect, a base plate of copper, copper alloy or
the like is employed, upon which is laid a suitable thickness of gold leaf of a
lower grade than that which is to appear on the surface, and upon this thickness
of gold leaf is placed a thin sheet or leaf of a better quality, say for example 18
or 22 carat and the base plate and the two thicknesses of gold are submitted
to heavy hydraulic pressure which has the effect of combining the several thick-
nesses.
Instead of two thicknesses of gold, several thicknesses thereof may be
employed.
By the means hereinbefore described, the appearance. of the article will be
improved inasmuch as the appearance of the gold will be more or less unaffected
by the colour of the base plate, and the base plate will be protected by a heavier
coating of gold than heretofore, inasmuch as the use of the lower grade gold
enables such thickness to be greatly increased at the same cost whilst the wear
of the article will be much improved, inasmuch as upon the outer coating being
worn through, a thickness of gold of a harder and more durable quality will
take its place.
DL 90th dow of August 1897
VAUGHAN & SON,
Agents for the Applicant.

page_text: and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statement:-
-
My said invention relates to improvements in or connected with rolled gold
plate.
According to the method of manufacture at present adopted, rolled gold plate
consists of a base plate of copper, copper alloy or the like covered with a gold
leaf or a sheet of gold of a suitable thickness the same being heated and pressed
together by heavy pressure.
When the covering of gold thus obtained is of good quality, say, for example,
22 carat gold, it is, for the sake of economy, necessarily extremely thin, and is
liable to become speedily worn through whereby its color is affected by that of
the base plate, which is liable to become more or less exposed at the worn parts
of the plate, and the object of the present invention is to render gold plate more
durable than heretofore, and also to more or less preserve the appearance thereof,
whilst, at the same time, the gold is rendered more capable of resisting the
action of the oxidation of the base plate.
In carrying the invention into effect, a base plate of copper, copper alloy or the
like is employed, and a suitable thickness of gold leaf or plate of a lower grade
than that which is to appear on the surface is laid thereon and upon this thick-
ness of gold leaf or plate is placed a thin sheet or leaf of a better quality, say,
for example 18 or 22 carat, and the base plate and the two thicknesses of gold
are then heated and submitted to heavy pressure, which has the effect of com-
bining the several thicknesses, as in the ordinary method of manufacturing
rolled gold plate.
Instead of two thicknesses of gold, several thicknesses thereof may be
employed.
By the means herein before described, the appearance of the article will be
improved, inasmuch as the color of the surface gold will be more or less un-
affected by the color of the base plate, and the heavy pressure to which the plate
is subjected during manufacture causes the gold of one plate to be forced into
the pores of the gold of the adjacent plate whereby the surface plate is rendered
more durable.
The base plate will be protected by a heavier coating of gold than heretofore,
as the use of the lower grade gold enables the thickness of such coating to be
greatly increased at the same cost, whilst the wear of the article will be much
improved, inasmuch as upon the outer coating being worn through a thickness
of gold of a harder and more durable quality will take its place, the base plate
will at the worn parts be protected from the action of the atmosphere and con-
sequently the surface of the gold plate will be less liable to be affected by the
oxidation of the base plate at those parts.
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:
A rolled gold plate, comprising a base plate of copper, copper alloy or the like,
covered with two or more sheets of gold of different grades, substantially as
herein described and for the purpose stated.