Improvements in Photographic Cameras.
Year: 1889

page_text: Date of Application, 18th Mar., 1889
Complete Specification Left, 18th Dec., 1889-Accepted, 25th Jan., 1890
PROVISIONAL SPECIFICATION.
Improvements in Photographic Cameras.
I JAMES YATE JOHNSON of 47 Lincolns Inn Fields in the County of Middlesex
Gentleman do hereby declare the nature of this Invention which has been com-
municated to me from abroad by Henri Pusset of 48 Rue de Bondy Paris in the
Republic of France to be as follows:-
:―
An improved photographic camera according to this invention is provided with a
magazine containing a number of sensitive plates which are capable of being pushed
towards the front by a spring. These sensitive plates are separated from each other
by plates of ebonite or other material not liable to be affected by the chemicals -
employed in the developing process which may be performed in the interior of the
camera as hereinafter explained. The plates are pressed together by the action of
the spring and a partition working in suitable guides so as to push forward the plates
without inclining or tilting then may be interposed between the plates and the
spring at the back.
To charge the magazine with plates a slide at the back is drawn out so as to dis-
engage a sliding cover which being drawn back horizontally exposes the interior of
the magazine so that the plates can be inserted after which the magazine is closed by
returning the slides to their original position. When a plate has been exposed it is
pushed by means of a flexible slide or curtain into a light tight bag underneath the
magazine. The plate can then be passed through an opening in the lower part of
the back into a dish on the bottom of the camera in which it can ho developed the
process being watched through an opening covered with ruby glass in the top of the
camera. The interior of the camera is lighted during this operation by means of
one or more ruby glass windows or openings in the side or sides. These openings
may be provided with dark slides or shutters.
The developer is introduced into the dish through a rubber tube fitted to a short
tube attached to the bottom of the dish. This short tube protrudes through an opening
in the bottom of the camera so arranged as to admit of the necessary movements of
the dish.
The camera is provided with a sliding shutter which is retained in the closed position
by a spring catch. A rubber spring tends to pull down the shutter and uncover the
lens. By means of a rod the spring catch can be caused to release the shutter which
thereupon descends and uncovers the lens. A pin on the shutter then comes in contact
with a horizontal' rubber spring or band the elasticity of which causes the shutter to
rebound and return to the closed position where it is retained by the spring catch.
The shock is absorbed by a spring provided for the purpose.
To exclude light from the magazine the flexible slide or curtain hereinbefore referred
to is arranged to close the opening between the magazine and the camera and extends
downwards through an opening in the bottom of the magazine sufficiently to cover
the opening herein before referred to in the lower part of the back of the camera.
The opening in the bottom of the magazine for the passage of the shutter is closed by
a spring shutter when the slide or curtain is drawn up. This flexible slide works in
a vertical groove in the front of the magazine and in a horizontal groove in the top
of the latter.
The camera may be provided with two focus finders in which the image is projected
by a lens on to a mirror which reflects it on to ground glass screen in the usual way.
One of these focus finders is used for pictures taken with the longer axis of the plate
vertical the other serving for pictures taken with this axis horizontal. The apparatus
is further provided with a focus finder of special construction composed of a convex
mirror receiving light through an opening in the front of the camera and which can

page_text: be seen through an opening in the top of the camera. A small hole is formed in the
centre of this mirror and a thread or wire extending diagonally across the opening in
the front carries a register mark such as a small glass bead. In order to direct the
camera on an object it is held under the arm in such a position that the register or
bead coincides with the hole in the centre of the mirror. This mirror may be made
of glass tinned or simply blackened at the back.
Dated this 18th day of March 1889
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C.
COMPLETE SPECIFICATION.
Improvements in Photographic Cameras.
I, JAMES YATE JOHNSON of 47 Lincolns Inn Fields in the County of Middlesex,
Gentleman do hereby declare the nature of this Invention which has been com-
municated to me from abroad by Henri Pusset of 48 Rue de Bondy, Paris in the
Republic of France 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 Improvements in Photographic Cameras which according
to this Invention are provided with a magazine containing a number of sensitive
plates which are capable of being pushed towards the front so as to be exposed one
after the other, the said plates after exposive being pushed by the action of a curtain
into a suitable receptacle as hereinafter described.
And in order that this Invention may be fully understood 1 shall now proceed more
particularly to describe the same and for that purpose shall refer to the several figures
on the annexed Sheet of Drawings, the same numerals and letters of reference
indicating corresponding parts in all the figures.
Figure 1 of the accompanying Drawings represents in vertical section a camera
constructed according to this Invention.
This camera is provided with a chamber or magazine 1, containing the sensitive
plates 2; which are pushed forwards by a spring 3, being separated from each other by
plates of ebonite or other suitable material not liable to be affected by the action of
the chemicals employed in the developing, which as hereinafter explained, may be
performed in the camera itself. A board or plate of wood may be placed between the
plates and the spring in order to regulate the action of the latter.
To charge the magazine with plates, a slide 4, at the back is drawn out so as to dis-
engage a sliding cover 5, which when open exposes the interior of the magazine so
that the plates can be inserted therein. When a plate has been exposed, it is pushed
by means of a flexible slide or curtain 6, into a light tight bag 7, underneath the
magazine. The plate can then be passed through an opening 9, in the lower part of
the camera back into a dish 8, on the bottom of the camera in which it can be
developed, the process being watched through an opening 10, in the top of the camera
fitted with ruby glass. The interior of the camera is lighted during this operation
by means of one or more ruby glass windows or openings 11, in the side or sides.
All these openings may be protected by dark slides or shutters 12, if required.
The developer is introduced into the dish 8, through a rubber tube, fitted to a short
tube 14, attached to the bottom of the dish.
The plate, instead of being developed immediately, may be returned to the magazine,
being pushed up out of the bag at the back of the spring acting on the other plates
as indicated by the dotted lines, Figure 1.
Figure 2 represents a modified, and more simple, arrangement, in which the
developing chamber is dispensed with, and in place of the bag 7, Figure 1, a box or
compartment 1 is provided, being similar to the compartment 1, of the magazine, and
into which the plates, after exposure, are pushed by the descent of the curtain 6, as in
the arrangement hereinbefore described with reference to Figure 1.-Blade-springs r
Figure 3, are attached to the inside of the side a, so as to push the exposed plates b

page_text: backwards into the compartment 1° and leave a space for the reception of the edge of
the next plate, (d) to be pushed into the lower compartment. In this arrangement a
light tight bag may be substituted for the box 1'.
Figure 4 illustrates an automatic Shutter which may be employed with my improved
Camera. This shutter is provided with a plate p, pivoted at p¹, and is set by means
of an external knob being retained in the closed position or ready for action by a
spring catch or trigger q, acted on by a spring s. The catch 7, can be released by
simply pressing a knob t, so as to overcome the resistance of the spring s, whereupon
the spring v, pulls back the plate or shutter p to the position represented in the drawing
and in so doing momentarily exposes the plate.-The frames carrying the plates and
which are not claimed as part of my present Invention are composed of a thin metal
plate, the edges of which are turned up on three sides to facilitate the extraction of
the plates. The bent up edge on the side opposite to that at which the plates are
introduced is cut away or notched so as to enable the plates to be pushed with the
finger.
Having now particularly described and ascertained the nature of this Inven-
tion and in what manner the same is to be performed, 1 declare that what I
claim is :-
First. A photographic camera constructed with a magazine or compartments for
the plates and a developing chamber as herein before set forth, the plates being
pushed from one compartment into another, by the action of a curtain substantially
as hereinbefore described.
Second. A photographic camera constructed with a magazine from which the plates
after exposure are pushed by the action of the curtain into a compartment or receptacle
in the form of a bag, substantially as hereinbefore described, with reference to
Figure 1 of the accompanying Drawings or in the form of a box, substantially as
herein before described with reference to figure 2 the developing chamber being
dispensed with.
Third. The arrangements and combinations of parts constituting the improvements
in photographic Cameras as herein before described and illustrated in the acccompanying
Drawings.
1
101
Ր Diumumkan 1000
J. H. JOHNSON & Co.,
Agents.