Improvements in the Manufacture of Transparent Materials and the Application of the same to Photographic and other Purposes.
Year: 1892

page_text: Date of Application, 21st Apr., 1892
Complete Specification Left, 20th Jan., 1893-Accepted, 8th Apr., 1893
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Transparent Materials and the
Application of the same to Photographic and other Purposes.
I, THOMAS CHRISTY, of 25 Lime Street, London E.C., Merchant, do hereby
declare the nature of my said invention to be as follows:-
This invention relates to certain improvements or modifications in the manu-
facture of a transparent tissue described in Specifications No. 12,230 of 1890 and
No. 13917 of 1888.
It has more particularly for its object the rendering of such or similar material
suitable in photography, and its application to the manufacture of photographic
apparatuses and appliances, such as transparent changing or developing bags,
chambers, covers, window films, covering glass and the like and other purposes.
In carrying this invention into practice I make a solution of gelatine or equivalent
substance and incorporate therewith a ruby coloring matter of a nature which
does not allow the actinic rays of light to pass through, such as red and yellow
aniline or other colours. I also most generally add certain chemical agents which
will render the glutinous substance insoluble, such as a salt of chromium; or, I
subsequently subject the gelatinous substance to a fixing bath, such as chrome alum,
iron alum, or other agents having the same effect. I also most generally combine
glycerine with the glutinous matter, for the purpose of imparting flexible properties
to the same.
I either employ the gelatinous matter as a film upon glass, or otherwise; or I
treat suitable paper, silk tissues, or other fabric with the same, substantially as
described in the herein before mentioned Specifications No. 12,230 of 1890 and
No. 13,917 of 1888 and I apply such material as sheetings covers for cameras ;
screens; to the manufacture of transparent changing bags developing bags in form
of muffs, or otherwise, for photographic and other purposes.
Dated 21st April 1892.
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Transparent Materials and the
Application of the same to Photographic and other Purposes.
1, THOMAS CHRISTY of 25 Lime Street London E.C., Merchant, 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 relates to certain improvements or modifications in the manu-
facture of transparent tissue described in my Specifications No. 12,230, 1890 and
13917-1888 & it has more particularly for its object the rendering of such or
similar material suitable in photography for dark room illumination or its application
to the manufacture of photographic apparatus and appliances such as transparent
changing bags, chambers, covers, window blinds, films and the like and for other
purposes.
In carrying this invention into practice I make a solution of gelatine or an
equivalent substance and I incorporate therewith a ruby coloring matter of a
nature which does not allow the actinic rays of light to pass through, such as red
and yellow aniline or other dyes in these colors. I also most generally add certain
chemical agents which will render the glutinous substance insoluble such as a salt
[Price 8d.]

page_text: of chromium; or I subsequently subject the gelatinized substance to a fixing bath
such as chrome alum or other agent having the same effect. I also most generally
combine glycerine with the glutinous matter for the purpose of imparting flexible
properties to the same. I more generally prepare the glutinous solution substantially
as described in my Specification 12230-1890 and I employ the same as a film
upon glass or otherwise, or I treat suitable paper silk tissues or other fabrics with
the glutinous solution substantially as described in the herein before mentioned
Specification 12230-1890 and I apply the products as covers for cameras screens,
to the manufacture of developing bags in the form of muffs or otherwise for
photographic and for other purposes.
But instead of simply proceeding as above described I more generally prefer for
the purpose of this invention to produce a transparent tissue substantially as
described in my Specification 12230 1890 and as above referred to and then to
cover the surfaces of such material with a coat of siccative oil or a suitable varnish
and after drying the material is ready for the purposes herein intended.
The desired color is embodied with the material as herein described or as described
in my Specification 12230-1890 and sometimes for the purpose of intensifying the
color I also mix a suitable coloring matter with the oil or varnish with which the
material is to be coated.
may
also
Instead of producing a gelatinized base material as above referred to I
prepare a suitable paper or silk tissue or other material with a solution of glycerine.
I more generally employ an unsized or partially sized long fibred paper for the
purposes herein intended and I saturate the same with a solution of glycerine in
water, more generally a proportion of 3 to 4 parts of water to 1 part of glycerine
with which I incorporate any desirable dye or I dye the paper first to the required
color. The material is then dried and I then saturate it with a suitable siccative
oil or varnish and I more generally employ a quick drying flexible varnish I then
dry the material again after which it is ready for the purposes herein intended.
With the object of producing very intense colors and also to cover any minute
holes in the material I may also combine some of the coloring matter with the oil
or varnish with which the material is to be treated.
I wish it to be understood that I may also apply the improved material for some
of the purposes named in my Specification 12230-1890 such as for surgical
purposes and in this case coloring matters are more generally omitted.
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 :
1. The manufacture and application of material substantially as herein described
for purposes in photography requiring the exclusion of the active rays of light.
2. The application of the improved material for surgical and other purposes.
3. The improved material manufactured substantially as and for the purposes
herein described.