Improvements relating to the Manufacture of Reflectors.
Year: 1893

page_text: Date of Application, 10th Oct., 1893
Complete Specification Left, 19th June, 1894-Accepted, 21st July, 1894
PROVISIONAL SPECIFICATION.
Improvements relating to the Manufacture of Reflectors.
I, DAVID REICH, of 13 Czerningasse, Vienna II, in the Empire of Austria,
Manufacturer, do hereby declare the nature of this invention to be as follows:-
My invention relates to the manufacture of reflectors and comprises a method of
providing glass shades having a single wall with a reflecting silver coating so that
they may be used as reflectors.
For this purpose the glass shade made of any suitable form, either smooth,
figured or pressed, and which may be engraved or ground prior to the silvering, is
placed in a suitable vessel preferably consisting of glass and is brought together
with a silvering liquid.
In order to silver it on one side the glass shade, left closed at its upper central part,
is put upside down in the above-mentioned vessel which has a corresponding shape
so that the said central part of the same extends into a central depression in the
vessel. After this the silvering liquid is poured between the vessel and shade until
it reaches the upwardly turned edge of the shade.
If the glass shade is to be silvered on both sides it is placed after it has been
completely finished in the vessel, whereupon a second vessel resembling the first
but made of smaller size is put inside the glass shade, the central projecting part
of this second vessel extending into the central opening of the shade. Between the
two vessels the silvering liquid is poured until it reaches the upwardly turned edge
of the shade.
In both these cases a sufficient quantity of the silver will deposit on the portions
of the shade which are exposed to the liquid in from one-quarter to three-quarters
of an hour according to the temperature of the silvering liquid, the deposition
taking place in the first instance only upon the outside, and in the second instance
upon the outside and inside of the shade.
Then the shade is taken from the bath, rinsed with water and, if its central part
be closed, is ground at this point to obtain the aperture.
The silver coating on the outer surface of the glass shade is then coated with a
protecting material consisting of a solution of resin or sugar, and I dust bronze
powder upon this coating or provide an opaque colour thereon..
Such glass shades having a single wall reflect by their inner surface all the light
which they receive.
The silvering liquid employed may be produced in any of the various well known
manners. For instance use may be made of a mixture which consists of silver
nitrate dissolved in water and of caustic soda or ammonia, to this liquid being
added grape sugar or sal polychrestum Seignetti or also tartaric acid with candy
sugar.
7
200
1000

page_text: '
COMPLETE SPECIFICATION.
Improvements relating to the Manufacture of Reflectors.
I, DAVID REICH, of 13 Czerningasse, Vienna II, in the Empire of Austria,
Manufacturer, 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 :-
My invention relates to the manufacture of reflectors and comprises a method of
providing glass shades having a single wall with a reflecting silver coating so that
they may be used as reflectors.
'
For this purpose the glass shade made of any suitable form, either smooth,
figured or pressed, and which may be engraved or ground prior to the silvering, is
placed in a suitable vessel preferably consisting of glass and is brought together
with a silvering liquid.
In the accompanying drawing I have shown two mould sfor carrying the invention
into practice.
Figure 1 is a section of a mould for use in silvering a single wall glass shade on
one side, and
Figure 2 a mould adapted for use in silvering both sides.
As shown in Figure 1 the glass shade B, which is left closed at its upper central
part b, is put upside down in the above-mentioned vessel A which has a corre-
sponding shape so that the said central part 6 of the same extends into a central
depression a in the vessel. After this the silvering liquid is poured between the
vessel and shade until it reaches the upwardly turned edge of the shade.
If the glass shade B is to be silvered on both sides it is placed, after it has been
completely finished, in the vessel A, whereupon a second vessel C resembling the
first but made of smaller size is put inside the glass shade, the central projecting
part of this second vessel extending into the central opening of the shade.
Between the two vessels A and C the silvering liquid is poured until it reaches the
upwardly turned edge of the shade.
In both these cases a sufficient quantity of the silver will deposit on the portions
of the shade which are exposed to the liquid in from one-quarter to three-quarters
of an hour according to the temperature of the silvering liquid, the deposition
taking place in the first instance only upon the outside, and in the second instance
upon the outside and inside of the shade.
The shade is then taken from the bath, rinsed with water and, if its central part b
is closed (as in Figure 1) it is ground at this point to obtain the aperture.
The silver coating on the outer surface of the glass shade is then coated with a
protecting material consisting of a solution of resin or sugar, and I dust bronze
powder upon this coating or provide an opaque colour thereon.
Such glass shades having a single wall reflect by their inner surface all the light
which they receive.
The silvering liquid employed may be produced in any of the various well-known
manners. For instance use may be made of a mixture which consists of silver
nitrate dissolved in water and of caustic soda or ammonia, to this liquid being
added grape sugar or sal polychrestum Seignetti or also tartaric acid with candy
sugar.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
First. A method of manufacturing glass shade reflectors having a single wall,
which consists in bringing the glass shade B, made of any desired form in any
ouitable manner, in contact with a silvering liquid either in a vessel A, if the shade
is left closed at the top, or with a completely finished shade between two vessels A

page_text: and C, removing it after the deposition of the layer of silver, and providing it at its
outer surface with a protecting coating after the upper part if closed has been
ground off.
Second. Glass shade reflectors having a single wall, which have been provided in.
5 the above described manner with a reflecting cover or coating.
Dated this 19th day of June 1894.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.