IMPROVEMENTS IN PHOTOGRAPHIC FILM HOLDERS
Year: 1885

page_text: I ALFRED JULIUS BOULT of 323 High Holborn, in the county of Middlesex,
Engineer do hereby declare the nature of this invention for "IMPROVEMENTS
IN PHOTOGRAPHIC FILM HOLDERS" (a communication from George Eastman, and
William Hall Walker, of Rochester, New York, United States of America, Manu-
facturers), and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
The present invention relates to improvements in holders or means for sup-
porting photographic films during exposure in the camera, which improvements are
fully described in the accompanying specification and drawings and the novel
features thereof specified in the claims annexed to the said specification.
In the accompanying drawings representing the present invention :-
Figure 1 is a front elevation.
Figure 2 is a transverse section on the line X. X Figure 1.
Figure 3 is an edge view.
Figure 4 is a longitudinal section on an enlarged scale showing the film secured
in the holder.
In the accompanying drawings representing this improved film-holder, S is a
support of suitable material corresponding in size and shape with the glass plates
ordinarily used in the production of photographic negatives. This support may be
of glass, hard-rubber, celluloid, vulcanite, vulcanized fibre, wood, one or more thick-
nesses of veneer, paste-board, press-board, metal or other suitable material. The
frame F may be made of any suitable metal, preferably in one piece to avoid laps
or joints. The centre of the frame is cut out to within about one fourth of one
inch from the edge of the plate, and two of the opposite sides (preferably the
longest) may be turned over as shown at L Figure 2 for the purpose of stiffening
the frame. The shorter sides are turned backwards and bent slightly inward in
such a manner as to clasp two of the opposite edges of the support when pressed
down upon it.
•
The method of using this improved film-holder, is as follows:-
A sensitive film cut slightly smaller than the support is laid chemical side
upward upon the support then the frame F is laid down upon it and pressed down

page_text: along the edges so that the bent edges or clips C. C. of the frame clasp over the
edges of the support, and hold the film firmly to its face. The frame F being thin
is generally found in practice not to interfere with the proper focussing of the
image on the film. The holder having the film secured thereto is then exposed in
the camera in any ordinary or suitable exposing frame. In order to facilitate the
removal of the film from the holder the corner or corners of the frame are cut off
as shown at D Figure 1 so as to uncover the corner of the support S. The operator
detaches the frame from the support by pressing on the corner of the latter.
The frame may be stiffened at the corners by providing it with the corrugations
II Figure 1. The whole frame is conveniently made by stamping or pressing it
out of sheet metal in suitable dies.
The clips need not extend the whole length or width of the support.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed as communicated to
me by my foreign correspondent I declare that what I claim is
1. The herein described photographic film holder consisting of the plate or
support S and open frame F provided with clips C. C. adapted to fit over two
opposite sides of the support and to hold the film against the face side of the
support substantially as and for the purposes set forth.
2. The herein described photographic film-holder consisting of the plate or
support S and open frame F having one or more truncated corners D and provided
with clips C. C. adapted to fit over two opposite sides of the support and to hold
the film against the face side of the support substantially as and for the purposes
set forth.
3. The herein-described photographic film-holder, consisting of the plate or
support S and open frame F provided with clips C. C. and corrugations I. I. at the
corners substantially as and for the purposes set forth.