IMPROVEMENTS IN THE MANUFACTURE OF REFLECTORS OR REFLECTING LAMP-SHADES OR GLOBES
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by Henry Harris Lake at the Office of
the Commissioners of Patents on the 27th January 1883. Communicated
to him from abroad by Joh Oertel and Company of Haida Bohemia
HENRY HARRIS LAKE, of the firm of Haseltine, Lake, and Co, Patent Agents,
Southampton Buildings, London, "IMPROVEMENTS IN THE MANUFACTURE OF
REFLECTORS OR REFLECTING LAMP-SHADES OR GLOBES [A communication to him
from abroad by Joh Oertel and Company of Haida Bohemia]
This invention relates to the manufacture of reflecting glass lamp-shades, and
globes, which are outwardly plated and ornamented and may be of any desired
shape and size and made of any kind of transparent glass. The said reflecting
shades or globes are applicable for every kind of illuminating apparatus, such as
pedestal lamps, chandeliers, or gas lights.
By plating the outside of the said glass articles they are converted internally
into mirrors whereby the reflection of the luminous rays emating from the flame is
rendered more perfect and complete than has heretofore been practicable.
The improved shades which unlike the existing duplex plated glass shades, are
made of one thickness of glass only are manufactured by means of very simple
apparatus hereinafter described, and the plating is effected in an enclosed space by
means of a solution of nitrate of silver
In carrying the said invention into practice a plain glass shade previously
finished as to shape, is placed upon an india-rubber ring or disc, which rests upon
a metal or wooden plate. Over the said glass shade is placed a glass jacket having
a diameter at least half an inch greater than that of the glass shade to be plated,
and precisely of the same height as the said shade. At the upper part of the
shade, as well as of the jacket, is placed another india-rubber ring or disc covered
by a metal or wooden plate. The said two plates are drawn together by a screw
as far as the elasticity of the rubber will permit. In consequence of the
pressure
of the rubber brought to bear upon the edge of the shade and of the jacket, a
watertight sealing is effected between the two at the top as well as at the bottom,
which will allow of pouring the plating solution into the intervening space between
Dmine D71

page_text: the shade and the jacket, for which purpose a small aperture is formed in the upper
plate and ring or disc
After pouring in the solution the said aperture is stopped up by means of an India-
rubber plug, and the whole apparatus is then rotated so that the liquid silver may
completely set over every part of the external surface of the shade,-which
operation will not occupy more than about five minutes. This being effected, the
superflous silver is drawn off through the said opening, the screw which holds the
two metal plates is loosened, the jacket is lifted off the shade, and the latter will
be found plated outwardly.
To preserve the plating upon the shade, it is coated on the silvered side with a
varnish the composition of which is as follows, that is to say: Sandarach resin,
alcohol, venetian turpentine, shellac, and lavender oil.
After giving the shade a smooth even coating of this varnish over the entire
silvered side, the said side can then be ornamented with any design according to
requirement