Improvements in or connected with the Preservation of Photographs Produced on Slate for Decorative or Artistic Purposes.
Year: 1893

page_text: Date of Application, 31st May, 1893
Complete Specification Left, 22nd Feb., 1894-Accepted, 28th Apr., 1894
PROVISIONAL SPECIFICATION.
Improvements in or connected with the Preservation of Photographs
Produced on Slate for Decorative or Artistic Purposes.
We, WILLIAM JONES and HUGH JONES trading as Jones Bros. & Co. of
Garth Plain and Enamelled Slate Works, Garth, Bangor, North Wales, Slate
Enamellers, do hereby declare the nature of this invention to be as follows:-
This invention has for its object the rendering of photographs on slate
impregnable to damp and atmospheric influences, whereby the photographs keep
their distinctness much longer.
We carry out our invention as follows-
The part of the slate upon which the photograph is to be produced is first of all
enamelled white or tinted by a process of slate enamelling. The photograph is
then produced on the white or tinted part by the ordinary processes of photography.
When the photograph is so produced, it is then enamelled, being covered over with
a very thin coating of very pale polishing copal varnish. The slate is placed in a
stove and subjected to about 170 degrees of heat, after which the photograph is
polished by being rubbed with very soft rotten stone.
Dated this 30th day of May 1893.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in or connected with the Preservation of Photographs
Produced on Slate for Decorative or Artistic Purposes.
We, WILLIAM JONES and HUGH JONES trading as Jones Bros. & Co. Garth
Plain and Enamelled Slate Works Garth, Bangor, North Wales, Slate Enamellers,
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:―
This invention has for its objects the rendering of photographs produced on slate
for decorative or artistic purposes impregnable to damp and atmospheric influences
whereby the photographs keep their distinctness much longer.
We carry out our invention as follows:-
The part of the slate upon which the photograph is to be produced is first of all
enamelled white or tinted by a process of slate enamelling. The photograph is
then produced on the white or tinted part by the ordinary processes of photography.
When the photograph is so produced it is then enamelled, being covered with a
very thin coating of very pale polishing copal varnish. The slate is placed in a
stove and subjected to about 170 degrees of heat, after which the photograph is
polished by being rubbed with very soft rotten stone.
Having now particularly described and ascertained the nature of our said inven-
tion & in what manner the same is to be performed we declare that what we
claim is:-
The process of producing photographs on slate by first enamelling the slate, a
white or tinted colour, then producing the image or the like by photography upon

page_text: the surface of the enamelled slate, then enamelling the photograph by a covering
of pale polishing varnish, which is heated and dried in a suitable stove, and
afterwards polished, substantially as and for the purpose described.
Dated this 22nd day of February 1894.
E. EATON,
Patent Agent for Applicants.