Improvements in Photographic Cameras.
Year: 1892

page_text: Date of Application, 2nd Mar., 1892
Complete Specification Left, 2nd Dec., 1892-Accepted, 7th Jan., 1893
PROVISIONAL SPECIFICATION.
Improvements in Photographic Cameras.
I. HENRY GRANT MADAN CONYBEARE, of The Hut, Ingatestone, in the
County of Essex, Gentleman, do hereby declare the nature of this invention to be
as follows:-
11
In a photographic camera box I suspend a box or slide containing the sensitive
film, by means of pivots so that the slide remains vertical when the camera is tilted
up or down. One pivot passes light tight through a tube which is attached at each
end to plates inside and outside the camera box. To the outer end of this pivot is
fixed an armn with a pin on it which may be held by a catch so as to prevent the
slide swinging. The inner end of the pivot fits into a square hole in the side of the
slide. In the side of the camera box is a horizontal slot through which the tube
passes enabling the plates with their tube to be moved horizontally. Through the
top of the slide passes a third pivot the lower end of which is fixed into a winding
roller. To the upper end is fixed a cross bar. Through the top of the camera box
a handle passes the lower end of which is forked enabling the cross bar attached to
the last mentioned pivot to swing in the fork.
The roller carrying the sensitive film before exposure is suspended in a frame
carried by pivots which drop into grooves in the top and bottom sides of the slide.
Attached to this frame are two springs carrying a bar which presses against the
film roller. A spiral spring is attached to the centre of frame and end of slide.
As an alternative to the winding roller two rollers may be used a winding roller
and a measuring roller, the handle used to turn the winding roller and having a
forked end is made to draw up and down through the top of the camera box.
The exposure shutter is a disc, to the centre axle of which is attached a spring
barrel. At two points on the disc are fixed pins. The release or escapement of
the shutter has two pallets. A. spring actuates the escapement in one direction.
Other forms of escapement having two pallets may be used. Instead of the spring
barrel being fixed to the axle of the disc a pinion may be fixed to the axle and
driven by a cog wheel fixed to a spring barrel.
Dated this 2nd day of March 1892.
CARPMAEL & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Photographic Cameras.
I, HENRY GRANT MADAN CONYBEARE, of The Hut Ingatestone in the
County of Essex, Gentleman, do hereby declare the nature of this invention and
in what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement :-
It is frequently desirable more especially when photographing architectural
objects, that the sensitive film should occupy a vertical position whilst the body of
the camera is inclined in an upward direction. The parallelism of those lines of
the picture which represent vertical portions of the object is thereby better
maintained.
Also when the film is carried upon a flexible material which whilst in the camera
is wound from roller to roller, it is necessary that the material should be tightly
strained between the rollers in order that the film during exposure may present a
plane surface to receive the image.

page_text: invention.
Figure 2 is a horizontal section of the slide containing the sensitive film.
Figure 3 is a rear elevation of the slide with the lid or cover removed.
Figure 4 is an elevation and Figure 5 is a sectional plan of one of the pivots of
the slide.
Figure 6 shows a modification.
In a photographic camera box A, I suspend a box or slide B containing the
sensitive film, by means of pivots so that the slide remains vertical when the
camera is tilted up or down. One of the pivots marked D passes light tight
through a short tube F which is attached at each end to plates E. To the outer
end of the pivot D is fixed a milled head, with a segment cut out of it, enabling it
to be fixed by turning the circular catch X and so stop the slide from swinging.
The catch as is shown by the Figures 4 and 5 is a stud with an arm projecting
from it. This stud is mounted upon the outer plate E and there is a notch in it
on one side. The stud can be easily turned by means of its arm and when the
notch is suitably placed the pivot D can turn freely but when the stud is in the
segmental recess the pivot is locked fast. The inner end of the pivot D screws into
a boss upon the three sided rectangular frame S. The slide or box B is fitted into
the frame S by means of grooves C on the ends of the box and it is easily lifted in
and out. The pivots may however be attached direct to the ends of the slide B
instead of to the frame S.
In the side of the camera A is a horizontal slot through which the tube F passes
enabling the plates E with their tube to be moved horizontally. This is done
when it is desired to set one of the pivots nearer to the front of the camera than
the other. Through the top of the box or slide B passes a pivot G the lower end
is fixed into a winding roller H to the upper end is fixed a cross bar as is seen in
Figure 1. Through the top of the camera A, a handle W passes, the lower end of
which is forked, it embraces the cross bar attached to G but leaving it free to
swing in the fork. By turning the handle W the material with the sensitive film
upon it is drawn forward after exposure and wound upon the roller H whilst the
portion of the material to be next employed is unwound from the roller I. The
swinging slide B may be made so as to allow a plate or film to be dropped into it
from the top as shown at B' Figure 6. U is a rod having bent arms at the ends,
one of these arms being brought against the end of the slide, at the moment of
exposure, stops it from vibrating. This is brought about in the following
1.

page_text: manner :-)
-When the camera is properly placed for taking the picture the door or
lid at the top is closed and the pusher V is thereby depressed; it acts upon a
short arm projecting at right angles from the rod U, this causes a partial rotation
of the arm and rod, with the result that a longer arm at the rear end of the
rod U is made to press upon the wall of the camera and the adjacent side of
the frame S.
The roller I carrying the sensitive film before exposure is suspended in a
frame K this frame is carried by pivots L which drop into grooves, in the top
and bottom sides of the slide B. Attached to this frame are two springs M
carrying a bar N which presses against the film roller.
The spring is attached to the frame K and to the slide B; it rocks the
frame K when the winding ceases and so the slack of the film is taken up.
Instead of the winding roller H two rollers may be used, one awinding roller
the other a measuring roller. H' is a retaining pawl.
The exposure shutter is formed by the mirror Q which is attached to a
thin plate hinged at R the lower part of the plate P being curved and having an
opening in it, which can pass between the lens and the sensitive film. On the
under side of the mirror is hinged separate thin plate Y, which falls after the
mirror has risen. The plate and mirror are actuated by a spring roller T attached
to the plate by a flexible band.
P, L is the photographic lens and its mounting.
In the use of the camera it is directed upon the object by observing the image
as seen on a diaphragm at the top of the camera when the lid or door is open.
When all is ready the door is closed and the cord Z is released. The spring
barrel T draws up the mirror Q and plate P and the exposure is given. The
plate Y is drawn up together with the plate P in its rapid upward movement but
directly afterwards falls again closing in the after part of the camera.
These arrangements for controlling the exposure however form no part of the
invention which I now claim.
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
claim is :-
1. In a hand camera suspending the box or slide which carries the sensitive film,
so that it remains vertical, when the camera is out of horizontal substantially as
described.
2. In a hand camera having a suspended film box or slide providing means sub-
stantially as described for clamping the slide at the moment of exposure.
3. The means substantially as described for winding forward the sensitive film
from roller to roller, where the same are carried in a suspended box or slide.
4. The means substantially as described of mounting the roller carrying the
sensitive film, whereby the slack of the film is taken up.
Dated the 30th day of November 1892.
H. G. M. CONYBEARE.