Improvements in Cameras, and. Accessories therefor.
Year: 1896

page_text: Date of Application 27th Jan., 1896.
Complete Specification sleft. 27th Oct: 1596-Accepted 27th Jan. 1897
PROVISIONAL SPECIFICATION.
Improvements in Cameras, and. Accessories therefor.
I, CHARLES EDMUND PECZENIK of 15 Jesus Lane, Cambridge; 'Gentleman,
do hereby declare the nature of this invention to be as follows:-
The improvements relate tonground glass; finders or focussing soreens made, to
slope or be when in use at or near a certain angle preferably .25% of the plane of
the top or side of the camera by means of a spring or equivalent device.exerting a
pressure upwards on said screen or the frame thereof and between it and the top.or
if desired the side of the camera, said screen being held at the desired angle by
means of two quadrant guides one on either side which pass into the sides of the
camera, or the screen may be otherwise held.
To said screen may be fitted a convenient mask or shade.
The camera is fitted with duplex lenses one for focussing or finding and the
other for photographing; as at present the focussing lense image being reflected by
a mirror which is arranged at a suitable angle to the, lense to reflect on 'to the
improved screen: as at present.
The improvements also embrace, a box which carries the lenses. and, which box
racks into the main box on the telescopic principle thus saving a considerable
amount of room.
The improved focussing screen comes up to the required angle automatically,
that is to say, when the inner box is racked out it releases a spring catch.. The
mask or shade also comes up automatically by means of a small metal..tongue,
which when the ground glass has come up to its given.angle, loses the power it had
of keeping the lid of-the shade down by pressing against the back of the camera at
an angle. Wherefore both the ground glass screen and its shade come up in their
right place on the inner box being racked out.
When a picture has. been taken the inner box is racked in, the shade pressed
down with the hand and subsequently both the shade and mirror are kept down
horizontally, the ground glass by means of the spring catch.referred to above, and
the shade by means of the metal tongue.
The improvements further embrace a novel arrangement of a recessed,door made
to slide in the thickness of the wall of the front of the camera.
Dated thie 27th day of January 180
HERBERT HADDAN 2; Co
18 Buckingham Street, Strand, London, W.C., Agents to Applicant.
18 Buckingham Street, Strand, London, W.C., Agents to Applicant.
COMPLETE SPECIFICATION.
Improvements in Cameras, and Accessories therefor.
I CHARLES EDMUND PECZENIK of 15 Jesus Lane Cambridge Gentleman,
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:-
The improvements relate to ground glass finders or focussing screens which I
make to slope, preferably at an angle of 25° to the plane of the top of the camora
Improvements in Cameras, and Accessories therefor.
I CHARLES EDMUND PECZENIK of 15 Jesus Lane Cambridge Gentleman,
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 :-
The improvements relate to ground glass finders or focussing screens which I
make to slope, preferably at an angle of 25° to the plane of the top of the camera

page_text: together with a mirror which is preferably placed at an angle of 30° with the plane
of the top of the camera. The frame of the ground glass finder is hinged at the
back to the box of the camera & a spring is placed in such a nanner as to force
the frame upwards, the angle to which it rises being controlled by two quadrant
guides one on each side coming against a stop pin in the camera, or in any other
suitable manner. The screen is fitted with a hood or cover, which is also actuated
by a spring so as to work automatically..."
The camera is fitted with duplicate lenses one for focussing or finding & the
other for photographing, as at present constructed; the focussing. lense image is
reflected by a mirror onto a ground glass screen at the angle as described above.
The improvement also includes a box of suitable size to carry the lenses & which
racks into the main box on the telescope principle thus saving room. The screen
& hood come to the correct position automatically, that is when the inuer box is
racked out a catch holding the screen down is liberated which rising causes a
tongue of metal holding the hooil down to be freed, thus allowing the springs to
come into action. The improvement also includes a sliding door or shutter made
in the thickness of the main door to close over the lense openings to keep
dust etc. out.
I will now proceed to describe my invention with reference to the drawings in
which the letters & figures of reference refer to the same parts in the different
figures.
Figure 1 is a side sectional elevation through centre of the camera.
Figure 2 is a plan of camera.
Figure 3 is a front elevation of camera.
Figure 4 is a front elevation of main door.
Figure 5 is a side-section of main door showing the sliding door or shutter,
Figure 6 is a cross section of main door & shutter.
Figure 7 is an enlarged section of ground glass frame catch.
A. Fig. 1. is a board hinged to the frame at D & held up by a spring, C is a
leather flexible hood fastened to the ground glass frame E & the board A so as to
keep the light from the focussing screen, with a suitable opening 1 Fig. 2 through
which to see the image that is thrown on the screen by the mirror & finding
...lense.
The frame E is hinged to the main box V & has a spring forceing it up against
the stop quadrants X & pins Z. His a spring catch which normally stands in the
position shown by the dotted lines, and engages with the plate 2 in the frame E
thus holding it down, B is a tongue of metal which when A is pressed down
engages with a pin G which projects from the back of the camera for that purpose.
The catch H has a downward projecting piece J which engages with a pin 3 on
the sliding box Y, on Y being racked out E springs up until it is stopped by the
quadrants & in so doing places the tongue B at such an angle that it leaves the
pin G thus both frame E & hood Cassume their correct places automatically. Fis
Hexible leather attached to frame E & the main box V to exclude all light from
the mirror L. M is the focussing lens which reflects the image on to the mirror L,
which from thence is cast on to the ground glass screen 4 thus giving a ready
means of focussing.
N is a bellows of ordinary construction which is connected to the back of an
ordinary time & instantaneous shutter P which is also connected to the wood frame
which carries the lenses. Qis a rod terminating in. a, handle 9, to regulate the
speed of the shutter P.
R is an ordinary rack & pinion; S is a door hinged at the top for the purpose of
taking the lenses out & adjusting the shutter etc., T is a sliding door or shutter in
the thickness of the main door S to close the lense holes & keep.out dust etc. Uis
a knob to push T back & forth with. M is the finding lens the photographing
lense, Y is a sliding box carrying the lenses as described, W, is a raised part of tho
main box V which carries the catch H as described. Figure 2. is a plan of the
camera with the sliding box Y extended & the hood & ground glass screen raised,

page_text: 1 is the slot referred to before, 5 is the handle to operate the rack & pinion R.
6 is a handle to carry camera by. 9 is the speed regulator handle of said shutter.
10 is a level.
Figuro 3 is a front elevation 11 is a lever for working an iris diaphragm, 12 is a
radius slot for 11 to work in. 13, is a small finder for use when camera is laid on
its side. 14 is a slot in the main door for the knob U to work in when shutter T
is moved.
Figures 4. 5. 6 are details of the door & shutter the letters & numbers of
reference being the same as before. Figure 7 is an enlarged section of catch H.
for the ground glass frame E in which I is a catch to pull back H by hand
instead of racking out Y, the other letters of reference being the same as in
Figure 1.
Having now particularly described and ascertained the nature of my inven
tion & in what manner the same is to be performed I declare that what I
claim is-
1. In hand cameras the raising of a ground glass screen to an angle & a hood or
cover over the screen automatically by the racking out of the sliding box as & for
the purpose described.
2. In hand cameras in combination with automatically raising the ground glass.
soreen & hood, a sliding door or shutter in the thickness of the main door,.
substantially as and for the purpose described.
Dated this
der of October 1806
CHARLES E. PECZENIK,
15 Jesus Lane, Cambridge..