IMPROVED PERMANENT PHOTOGRAPHS ON GLASS, AND PROCESS FOR PRODUCING THE SAME
Year: 1871

page_text: LETTERS PATENT to William Robert Lake, of the Firm of Haseltine,
.
Lake, & Co., Patent Agents, Southampton Buildings, London,
for the Invention of "IMPROVED PERMANENT PHOTOGRAPHS ON GLASS,
AND PROCESS FOR PRODUCING THE SAME."-A communication from abroad
by Ebenezer Ashton Goodes, of Philadelphia, Pennsylvania, United
States of America.
5
COMPLETE SPECIFICATION filed by the said William Robert Lake
at the Office of the Commissioners of Patents, with his Petition
and Declaration, on the 20th April 1871, pursuant to the 9th
Section of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London, send greeting.
WHEREAS I am in possession of an Invention for "IMPROVED PER-
MANENT PHOTOGRAPHS ON GLASS, AND PROCESS POR PRODUCING THE SAME," and

page_text: have petitioned Her Majesty to grant unto me, my executors, adminis-
trators, and assigns, Her Royal Letters Patent for the same, and have
made solemn Declaration that it has been communicated to me from
abroad by Ebenezer Ashton Goodes, of Philadelphia, Pennsylvania,
United States of America.
NOW KNOW YE, that I, the said William Robert Lake, do hereby
declare that the following Complete Specification, under my hand and
scal, fully describes and ascertains the nature of the said Invention,
and in what manner the same is to be performed, in and by the following
statement:-
This Invention relates to a positive or negative photographic picturo
permanently stained on glass, the picture being rendered proof against
water, light, oils, and most of the known acids by the application of
heat, whereby the silver (or a portion of the same) used in the pro-
duction of the picture by the ordinary photographic process is caused
to be retained by the glass, and the above-named qualities are imparted
to the picture.
In carrying this Invention into practice the photograph is taken upon
glass in the usual way by coating the plate with bromoiodized collodion,
and exciting it in the silver bath, after which the picture is taken by
the camera or other means. The latent picture is then developed by
photo-sulphate of iron or pyrogallic acid, the latter being preferable.
It is then fixed by immersion in a solution of cyanide of potassium or
hypo-sulphate of soda, after which it is well washed and thoroughly
dried.
The picture is now ready for the staining process as follows :—Tho
glass plate is placed in an air-tight kiln, or otherwise subjected to a strong
heat, until every part of the photograph becomes a deep brown, care
being taken that every part of the picture is equally heated. It is then
gradually cooled, after which it may be placed in water, and a dark
brown powder formed on its surface will casily wash off, leaving a
perfect copy of the photograph permanently produced upon the glass
plate in tints varying from a pale yellow to a deep red or brown. By
this application of photography to the permanent staining of glass, the
most intricate and elaborate designs can be instantly placed upon glass
for shops, halls, .churches, carriages, and other structures. Emblematic
designs of a complicated nature can be stained on glass for windows of

page_text: rooms or halls. Monograms, names, portraits, or pictures can be
produced permanently upon manufactured articles of glass.
The said Invention can also be applied to ornamenting glass for lamp
shades or gas fixtures, coach and carriage lanterns, and for glass signs
for hotels, shops, and the like. It will also serve for permanently
staining scale marks upon gauges for steam engines, pumps, and so
forth, and for the manufacture of clock fronts and faces, and for other
useful purposes.
The photographic pictures produced by the above process are perfectly
weather proof, and the said Invention can be applied with advantage
for the general preservation of photographic negative and positive
pictures and designs, and also to the preservation of photographic copies
of valuable public or private documents, plans, views, autographs,
curiosities, and so forth. Also for the manufacture of water and heat
proof slides for magic lanterns, stercopticons, stereoscopes, and so
forth, which require frequent washing and cleaning. Also for the
production of waterproof microscopic pictures and copies of natural
objects.
This process, which consists in subjecting a photographic picture taken
in the usual way to various degrees, produces the following results :-
1. A clear picture of peculiar whiteness positive or negative. 2. A.
picture with metallic lustre, the silver being reduced to the metallic
state. 3. A picture indelibly stained upon the glass. A photographic
picture on being exposed to strong heat, soon becomes peculiarly white
and clear, and if the process is stopped here the first result is obtained.
If the heat is continued longer or suddenly increased the silver is
reduced to the metallic state and the second result is produced. By
continuing the heat still longer the surface of the glass becomes stained
on every part containing the slightest particles of silver, those parts
containing the most producing the darkest stain, the various degrees of
light and shade in the photograph producing corresponding degrees of
tint in the stained copy. This is the third result of the process, and a
picture is produced proof against the action of light, heat, cold, water,
or any other fluid, and all known acids with the exception of fluoric
acid.
Having thus fully described the said Invention as communicated to
me by my foreign correspondent, and shewn how the same may be

page_text: conveniently and advantageously carried into practice, I wish it dis-
tinctly understood that I do not confine myself to the precise details
hcrcin-above set forth, but I claim,―
First. A positive or negative photograph permanently stained on
glass.
Second. The application of heat to a photograph for the purpose of
producing a water and light proof picture.
Third. A photographic picture proof against light, water, oils, and all
known acids with the exception of fluoric acid.
Fourth. The photo-chemical process, substantially as above described
for permanently staining designs on glass.
Fifth. The application of light and heat to a salt of silver for the
purpose of producing and permanently staining upon glass letters,
designs, and so forth.
Sixth. The combined use of collodion, salts of silver, iron, and
potassium, when subjected to light and heat for the purpose of per-
manently staining designs or glass.
In witness whereof, I, the said William Robert Lake, have hereunto
set my hand and seal, this Nineteenth day of April, in
the year of our Lord One thousand eight hundred and seventy-
onc.
Witness,
E. C. JACKSON.
WILLIAM ROBERT LAKE. (L.S.)