Improvements in Photographic Cameras.
Year: 1891

page_text: Date of Application, 1st Oct., 1891
Complete Specification Left, 28th June, 1892-Accepted, 30th July, 1892
PROVISIONAL SPECIFICATION.
Improvements in Photographic Cameras.
I, ADOLF HESEKIEL of 32 Landsbergerstrasse Berlin N.O. 18 in the Empire
of Germany Doctor of Philosophy do hereby declare the nature of this invention
to be as follows :-
The object of the invention is firstly to economize space in the storage of the
sensitive plates within the camera and it consists in arranging side to side or one
above the other two chambers each intended to be filled with the holders in which
the sensitive plates are separately placed so that as each plate is exposed it may be
moved from the one chamber to the other the remaining plates in each chamber
being shifted the one set forward the other backward to provide space for the plate
so moved and to replace the vacant space at the back of the first chamber with a
plate from the second chamber. This is effected by two slides joined together by a
bridge so that they must be moved simultaneously, the one slide is adapted to catch
under the recently exposed plate so that when the slides are lifted or drawn out
this plate is conveyed to the other chamber and left there, the other slide is adapted
to catch over the plate at the other end of the said chamber so that when the slides
are moved in again this plate is carried from the second to the first chamber. Springs
press the plates along in the chambers.
The number of plates moved, that is of exposures made, is indicated by the
following contrivance. A numbered disk is pivoted so that a number on the
circumference may show before a small window in the back of the camera.
This
disk carries an interiorly toothed wheel with inclined teeth. On one of the slides
is a pin so that when the slide is moved into its outermost position this pin comes in
contact with the side of one of the teeth and moves this tooth with the wheel and
disk; on the return of the slide the same pins strikes on the opposite side of the
wheel and moves the wheel by arriving against the inclined face of a tooth on this
side, thus with both movements changing the position of the disk sufficiently to
bring the next succeeding number before the window.
A further improvement relates to the focussing and finding of the view when the
plates remain in position in the camera. The rays from the lens are deflected by
an inclined mirror onto a ground glass at right angles to the sensitive plate in the
known manner but this ground glass plate is enclosed in a space provided with a
door so that darkness prevailing in this space even with the door open the view is
much more clearly seen than when the ground glass is in the outside of the camera,
no focussing cloth being required. As the ground glass is a part of the wall of the
actual camera or photographing chaniber itself the mirror is hinged so that it may
be closed over the ground glass and thus prevent access of light through the latter ;
when the mirror is in position for focussing or view finding it lies upon a screen
preventing passage of light to the plate hidden behind the mirror the latter covering
the hole in the screen through which the light would otherwise pass from the lens
to the plate.
It is preferable that the door aforesaid should only be opened when the mirror
is actually is position for focussing. This is effected by providing a spring for
closing the door and a rod for thrusting the latter open, this rod being moved by
a rotary arm or tappet on a spindle turned by the operator. The spindle carries a
second arm with a pin engaging in a slot in the side of the frame of the mirror so
that by turning the spindle the mirror may be moved into or out of position for
focussing, the tappet does not strike.the rod until after the mirror is in position for

page_text: focussing, and it leaves the rod before the mirror is moved on the reverse motion of
the spindle.
Dated thin 1nt dow of October 1901
HERBERT & Co.,
Agents to Applicant.
COMPLETE SPECIFICATION.
Improvements in Photographic Cameras.
I, ADOLF HESEKIEL, of 32 Landsbergerstrasse, Berlin, N.O. 18, in the Empire
of Germany, Doctor of Philosophy, 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 object of the invention is firstly to economize space in the storage of the
sensitive plates within the camera and it consists in arranging side to side or one
above the other two chambers each intended to be filled with the holders in which the
sensitive plates are separately placed so that as each plate is exposed it may be moved
from the one chamber to the other the remaining plates in each chamber being shifted
the one set forward the other backward to provide space for the plate so moved
and to replace the vacant space at the back of the first chamber with a plate from
the second chamber. This is effected by two slides joined together by a bridge so
that they must be moved simultaneously, the one slide is adapted to catch under
the recently exposed plate so that when the slides are lifted or drawn out this plate
is conveyed to the other chamber and left there, the other slide is adapted to catch
over the plate at the other end of the said chamber so that when the slides are
moved in again this plate is carried from the second to the first chamber. Springs
press the plates along in the chambers.
The number of plates moved, that is of exposures made, is indicated by the
following contrivance. A numbered disk is pivoted so that a number on the
circumference may show before a small window in the back of the camera. This
disk carries an interiorly toothed wheel with inclined teeth. On one of the slides
is a pin so that when the slide is moved into its outermost position this pin comes in
contact with the side of one of the teeth and moves this tooth and with it the
wheel and disk; on the return of the slide the same pin strikes on the opposite
side of the wheel and moves the wheel by arriving against the inclined face of a
tooth on this side, thus with both movements changing the position of the disk
sufficiently to bring the next succeeding number before the window.
A further improvement relates to the focussing and finding of the view when the
plates remain in position in the camera. The rays from the lens are deflected by
an inclined mirror onto a ground glass at right angles to the sensitive plate in the
known manner but this ground-glass plate is enclosed in a space provided with a
door so that darkness prevailing in this space even with the door open the view is
much more clearly seen than when the ground glass is in the outside of the camera,
no focussing cloth being required. As the ground glass is a part of the wall of the
actual camera or photographing chamber itself the mirror is hinged so that it may
be closed over the ground glass and thus prevent access of light through the latter ;
when the mirror is in position for focussing or view finding, it lies upon a screen
preventing passage of light to the plate hidden behind the mirror the latter
covering the hole in the screen through which the light would otherwsie pass from
the lens to the plate.
It is preferable that the door aforesaid should only be opened when the mirror is
actually in position for focussing. This is effected by providing a spring for closing
the door and a rod for thrusting the latter open, this rod being moved by a rotary
arm or tappet on a spindle turned by the operator. The spindle carries a second
arm with a pin engaging in a slot in the side of the frame of the mirror so that by
turning the spindle the mirror may be moved into or out of position for focussing,

page_text: the tappet does not strike the rod until after the mirror is in position for focussing,:
and it leaves the rod before the mirror is moved on the reverse motion of the
spindle.
The method of carrying this invention into practice will be readily understood
by the help of the annexed drawings in which
Fig. 1 is a longitudinal vertical section through the camera showing the mirror in .
position for focussing and the plate lifting frame partly raised.
Fig. 2 is a similar broken section showing the lifting frame fully raised.
Fig. 3 is a broken cross section showing the mirror raised.
Fig. 4 is a cross section showing the back member of the lifting frame.
Fig. 5 is a similar view showing the front member thereof.
Fig. 6 is a longitudinal section and Fig. 7 a horizontal section of the camera with
parts in position for exposure of the plate.
In the back of the camera are the two compartments ab divided by the floor i.
This floor does not extend up to the front or up to the back walls of the compart-
ments a or 6 but leaves a space for passage of the frames in which the plates are
placed from one to the other compartments. The horizontal bar having the
handle e in the middle carries at c and d the rear frame consisting of bar c
and cross-bar and the front frame consisting of bar & and frame d³ with
ledge d³. In front of the chamber b is the chamber n at the front end of
which is the lens m. The screen is placed at an angle of 45° of inclination
in the chamber n this screen being perforated with a hole of sufficient size in
the centre for allowing the image to be projected upon the foremost plate in the
chamber b. At or near the upper edge of the screen k¹ is hinged the mirror k
and in the wall of the chamber n is a rotary disk or arm with pin . This
disk has the handle or turn button 9 outside the camera so that when turned
in the direction of the arrow Fig. 1 the pin arrives in a slot in the edge of
the mirror and lifts the latter from off the screen up to lie against the
roof of the chamber n and so also cover the ground glass 2 let into said roof.
o is the compartment above the true camera compartment n and the ground glass
forms part of the floor thereof. is the lid and a spring to close the latter.
u is the rod to open the lid for seeing the view as projected on the ground
glass when the mirror k is lowered as in Fig. 1. This rod is lifted by tappet s.
The springs g and h move the plates respectively backward and forward in the
compartments a and b.
After a photograph has been taken the lifting-frame formerly pressed down, is
raised, the ledge a catching under the foremost plate in the compartment lifts the
latter into the compartment a, after which the frame is again pressed down causing
the rearmost plate in a to be pressed down into b by the cross-ledge c². The
handle g is revolved in the direction contrary to the arrow Fig. 1. This lowers
the mirror and afterwards opens the lid p so that the next view may be focussed ;
the handle is then turned in the opposite direction, the lid p closes and the mirror k
is afterwards raised, so that the view focussed may be photographed.
The counting-wheel or disk w with the serrated interior edge is moved by the
pin y as before described striking against the inclined faces of the teeth' of the
edge h.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a photographic camera, a changing box consisting of two compartments a
and each filled with plates in frames, in combination with a frame consisting of
two members adapted to be moved simultaneously, the one for raising the recently
exposed plate into the upper compartment, the other for lowering a plate into the
back of the lower compartment substantially as set forth.
2. In a photographic camera having a plate changing mechanism operated by a
reciprocally moved frame, a counting device consisting of an interiorly toothe.l or

page_text: serrated numbered wheel adapted to be moved by a pin on the frame moving
diametrically across the space in the wheel and operating on the inclined teeth
thereof.
D
3. In a photographic camera, the combination with the chamber n of the chamber o,
having a lid with spring and rod u, the ground glass 7, the mirror k and means 5
for operating said mirror and lid p consecutively as set forth.
P
Dated this 28th day of June 1892.
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C., Agents to Applicant.