Glass Plates, and in Substitution thereof.
Year: 1885

page_text: Glass Plates, and in Substitution thereof.
I Major JOHN BAILEY HOLROYDE of The Hollins Warley Near Halifax in the
county of York-do hereby declare the nature of the said Invention for "IMPROVE-
MENTS IN CAMERA SLIDES, DISPENSING WITH THE USE OF GLASS PLATES, AND IN
SUBSTITUTION THEREOF" to be as follows:-
The object of my invention is to enable a number of Gelatine, Bromide or other
sensitive films, supported on paper to be so placed as to enable a number of views
or pictures to be taken and changed while in the Field, thus dispensing with the
use of glass plates, and in substitution thereof.
I take a slide specially constructed so as to hold a number of Gelatino-Bromide,
or other sensitive coated papers (supported on some light flexible material which is
impervious to light) and place then one over the other in the slide to the required
number, and arranged so that the front one can be exposed to the light by the
opening and closing of a shutter in the usual way, and after this exposure, by
means of a bag (composed of some light-proof material) drawn over the slide and
made so as to allow the free use of the hands, whilst excluding the light, the paper
so exposed is removed from the front where it has previously been, and placed at
the rear of the other sensitive papers in the slide, thus allowing the one next in
position to take its turn for exposure By this means some dozen or more views,
can be taken without risk, and the weight of the whole, will not exceed that of
two glass plates of the same size, in an ordinary double frame, and the total bulk is
very slightly increased.
I also claim the arrangement of placing the Gelatino-Bromide or other sensitive
films supported on paper on both sides of the beforenamed flexible support or tablet,
whereby the picture taking capacity of the same is doubled, without any perceptible
increase of weight or bulk.
JOHN E. WALSH,
Crossley Street, Halifax,
Agent for the Applicant.

page_text: Glass Plates, and in Substitution thereof.
I Major JOHN BAILEY HOLROYDE of The Hollins, Warley, near Halifax in the
county of York 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:-
Fig. 1 shews section of dark slide. Figs. 2 and 3 shew forms of bag used.
The object of my invention is the adaption to any camera of a dark slide A see
Fig. 1, so made as to contain a number of sensitive papers which may be placed on
tablets or supports B in such a manner, that on opening the back C of this slide
(over which has been previously placed at its projecting end, a light proof bag D,
so constructed as to allow of the insertion of both hands or part of the body 1
see D¹ Fig. 3 without admitting light) from the top, the back of this slide falls
down, thus forms a table or rest, on which the sheets of sensitive paper, (on
supports B) about to be used will lay, on being pulled outwards, and backwards,
from their receptacle in the slide; thus enabling them to be manipulated so that
the one first exposed to light, can be either turned round, and the opposite side
exposed, or can be slipped to the back of those previously placed behind it, thereby
offering a fresh sensitive paper for exposure to the light, on drawing out the dark
shutter.
When the second tablet has been exposed the before named operation is repeated
and another fresh tablet is ready for exposure, and this process is continued until
the whole number of tablets originally placed in the slide have been exposed.
The bag D referred to is drawn over a ledge or groove formed around the outside
of the slide for its reception, and is held in its place against such ledge or groove
by an elastic band, or a draw string in the way usual with bags; and so fixed as
to be easily taken off or put on as may be required, or it may be made like B¹,
with a square frame, attached to fit the slide, and be drawn over the head, and
shoulders of the operator, when in use, and fastened around the waist.
This bag may also be made so as to be used as a focussing cloth, by having a
flap at the bottom which will button over, and keep out the light; when
unbuttoned, will leave the bottom open, and admit a view of the ground glass slide,
thus dispensing with a separate focussing cloth.
The tablets for holding the sheets of sensitive paper, which are to be used
I make by preference of ferrotype-plate but they will answer equally as well, if
made of vulcanite, thin veneer, cardboard or other suitable light-proof flexible
material, and the pieces of sensitive paper on which the pictures are to be taken
are attached to these tablets, by the use of fish glue, gum, or other suitable adhesive
substance.
The picture taking capacity of the slide before referred to, may be increased two
fold, without increase of weight, by placing the sensitive paper on each side of the
tablets, and they being impervious to light, will permit of first one side and then
the other being exposed for pictures before removal to the back.

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
1. A slide to contain a number of the tablets, bearing sensitive papers, or the
sensitive papers alone, as before described.
2. The bags for attachment thereto as before described.
3. The combination of the slide, tablets, and bag as before described.
4. The mode and arrangement of changing the sensitive papers when in the field
as before described.
5. The supporting of the sensitive papers on one or both sides, of light-proof
flexible tablets, to facilitate the use of the paper on exposure, and when changing
them, as before described.