IM- PROVEMENTS IN THE TREATMENT OF PHOTOGRAPHIC AND OTHER PICTURES PRINTED ON PAPER OR PERMEABLE TISSUE
Year: 1878

page_text: LETTERS PATENT to Jeremiah Gurney, of New York, in the United States of
America, prosently resident at Paris, in France, for the Invention of "IM-
PROVEMENTS IN THE TREATMENT OF PHOTOGRAPHIC AND OTHER PICTURES
PRINTED ON PAPER OR PERMEABLE TISSUE."
Sealed the 11th October 1878, and dated the 21st June 1878.
PROVISIONAL SPECIFICATION left by the said Jeremiah Gurney at the
Office of the Commissioners of Patents on the 21st June 1878.
JEREMIAH GURNEY, of New York, in the United States of America, presently
resident at Paris, in France. "IMPROVEMENTS IN THE TREATMENT OF PHOTO-
GRAPHIC AND OTHER PICTURES PRINTED ON PAPER OR PERMEABLE TISSUE."
This Invention relates to improvements which I have introduced into the
treatment of photographic, lithographic, and other pictures, on paper or permeable
tissue, with a view to render such prints transparent, impervious, and durable, and
further to facilitate the colouring or tinting of the saine.
In the execution of my Invention, I proceed as follows:-The print to be treated
is first saturated with melted paraffine for the purpose of rendering it impervious to
air and moisture. This may be effected by means of hot plates, as in the ordinary
waxed paper process, but as a rule I prefer to rub the paraffine over the back of
the sheet, previously stretched on a frame, and heated during the process to the
degree required for effecting complete fusion and saturation. The print is then
moistened on both sides with rectified petroleum or other suitable liquid hydro-
carbon, and after being slightly wiped is immersed in a tepid solution of gelatine,
on withdrawal from which it is placed, face downwards, on a collodionised plate,
submitted to pressure, and dried, as in the ordinary process of photographic
enamelling. It is finally detached from the collodionised plate and coated on either
one or both sides with a preservative varnish, composed of equal parts of plain
collodion and of a saturated solution of shellac in alcohol.

page_text: The prints treated as above may be either plain or already coloured, but, as a
general rule, I prefer to apply the colours cither wholly or partly to the reverse of
the paraffined and gelatined sheet before its removal from the collodionised glass,
and fix them by the subsequent coating of varnish as described. In either case,
the prints are rendered in a great measure inalterable, doubly protected as they are
against the action of air and moisture (and also of light to a certain extent) by
their complete saturation with the paraffine, and by the final coating of impervious
varnish.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Jeremiah Gurney in the Great Seal Patent Office on the 21st
December 1878.
JEREMIAH GURNEY, of New York, in the United States of America, presently
resident at Paris, in France. "IMPROVEMENTS IN THE TREATMENT OF PHOTO-
GRAPHIC AND OTHER PICTURES PRINTED ON PAPER OR PERMEABLE TISSUE."
This Invention relates to improvements which I have introduced into the treat-
ment of photographic, lithographic, and other pictures, on paper or permeable tissue,
with a view to render such prints transparent, impervious, and durable, and further
to facilitate the colouring or tinting of the same.
In the execution of my Invention I proceed as follows:-The print to be treated
is first saturated with melted paraffine for the purpose of rendering it impervious to
air and moisture. This may be effected by means of hot plates, as in the ordinary
waxed paper process, but, as a rule, I prefer to rub the paraffine over the back of
the sheet, previously stretched on a frame, and heated during the process to the
degree required for effecting complete fusion and saturation. The print is then
moistened on both sides with rectified petroleum or other suitable liquid hydro-
carbon, and after being slightly wiped is immersed in a tepid solution of gelatine,
on withdrawal from which it is placed face downwards on a collodionised plate,
submitted to pressure, and dried as in the ordinary process of photographic enamel-
ling. It is finally detached from the collodionised plate and coated on either one
or both sides with a preservative varnish composed of equal parts of plain collodion
and of a saturated solution of shellac in alcohol.
The prints treated as above may be either plain or already coloured, but, as a
general rule, I prefer to apply the colours cither wholly or partly to the reverse of
the paraffined and gelatined sheet before its removal from the collodionised glass,
and fix them by the subsequent coating of varnish, as described. In either case,
the prints are rendered in a great measure inalterable, doubly protected as they are
against the action of air and moisture (and also of light to a certain extent) by
their complete saturation with the paraffine, and by the final coating of impervious
varnish.

page_text: It should here be observed that one of the principal features of novelty in this
process consists in the substitution of melted paraffine for the wax and resinous
varnishes, which have already been used for giving transparency to photographic
prints, but which, from their alterability and difficulty of inanipulation, have been
found to produce defective results.
Having thus described the nature of my said Invention and the mode in which
I carry the same into effect, I would have it understood that what I claim is, the
treatment of photographic, lithographic, and other prints on paper or analogous
material by the successivo applications of melted paraffine, petroleum (or other
suitable liquid hydrocarbon), ordinary gelatine, and collodion enamel, and, finally,
of an impervious protecting varnish, substantially as above set forth.
In witness whereof, I, the said Jeremiah Gurney, have hereunto set my hand
and seal, this Sixteenth day of December, in the year of our Lord One
thousand eight hundred and seventy-eight.
STORY