Year: 1888

page_text: Onte of Application, 1st Feb., 1888
Complete Specification Left, 19th Sept., 1888
Complete Specification Accepted, 19th Oct., 1888
L, RUDOLPH KRUGENER of Bockenheim near Frankfort of Mam, Germany do nereby
declare the nature of this invention to be as follows:-
:-
My invention has for its object the construction of a photographic secret camera,
the mechanism of which, is so arranged, that it accurately fits in a casing which
resembles externally, in a deceiving manner, the form and the appearance of a book
and from which neither the objective, the instantaneous cover, nor other inconvenient
parts protrude which might give rise to the belief that there was something else other
than a book therein.
The apparatus comprises two main parts, the camera proper, which conceals the
objective cover and plates, and the walls of which are made of sheet metal, and the
casing of pasteboard or leather representing the book. Into the casing the camera is
inserted so that the part forming the backing of the book and containing the objective
opening invariably protrudes.
The camera proper consists of a small sheet metal case; the two longitudinal sides,
corresponding to the backing and edge of a book, are open. The said case is divided
by two sheet metal strips inserted crosswise, into three compartments. The one in
the middle contains the objective, the upper one can be filled with twenty four glass
plates each of which is placed in a small frame made of very thin sheet metal. They
have a back wall, and the edges bent round and providing a hold for the plate prevent
the coating on the back wall of the next small frame from being rubbed off. The
coated side is turned towards the objective.
A helical spring presses the small frames backwards firmly against a small board
It is on one side
which closes one longitudinal opening of the sheet metal case.
provided with a depression in the longitudinal direction in such a manner that a
small projecting ridge remains on either side against which the plates are pressed.
In the said depression a slide moves which carries at its upper end a projecting metal
strip of about four millimetres broad. To this strip which does not quite protrude to
the extent of the cover of a small frame beyond the projecting wooden ridge is secured
a steel rod carrying a knob.

page_text: If by means of this rod the slide is moved upwards, the strip slides upon the rear
side of the small frame until, being pressed by the helical spring, it slides down on
the strip and can then bear against the wooden ridges as the other part of the slide is
placed somewhat deeper than the said ridges. This takes place when the slide has
traversed the whole of its way. The strip has taken hold of only one small frame,
accordingly, it serves so to speak, as a hook, for by the ensuing downward movement
by means of the rod the small frame is displaced into the middle compartment, that is
to say, into the focus.
The said frame is prevented from falling over by two springs or by two narrow
guide slats. If it be the first frame, it is supported with its lower end upon the bent
edge of a plate that carries the helical spring. If after the exposure a second plate is
to be placed in the focus, the slide is pulled upwards. The hook-shaped strip takes
hold of a fresh plate by means of which the previously exposed plate is moved from
the focus into the lower compartment, after having moved the bent plate a little to the
interior, or else the small frame, if one was already there, by pressing upon the knob.
In the slit formed the small frame is moved, and it can, on the release of the knob be
moved quite down. This operation is continued until all the small frames have
passed from the upper compartment through the focus to the lower compartiment.
The board with the slide can be taken out, and the opening serves for filling and
emptying the small frames. Two short pins provided in the sheet metal casing of the
camera, and sunk into the wooden ridges of the boards prevent the small frames
springing out in the opening. Each of the said frames has upon the back a continuous
number in black upon a white ground.
Through a small window of red glass which is specially covered by a slide, the
exposures effected can be controlled.
camera.
The instantaneous closing device is placed in the backing of the book shaped
It is moved between two small boards the latter of which, forming the outer
one, is somewhat curved and constitutes the backing of the book camera, thereby
closing at the same time the second longitudinal opening of the small sheet
metal case.
As the sensitive plates are only inserted in small frames, and not in boxes, light
would enter the camera in the adjustment of the instantaneous closing device. A so
called safety slide has therefore been arranged in the same. This operates in such a
manner that it must be moved quite down, leaving the opening entirely free, before
the instantaneous closing device is disengaged.
Upon the slide is secured a small pin, which, when the slide is entirely drawn up,
is pressed against the inclined surface of a lever moving the latter to one side and
disengaging a pin of the drop slide. The sensitive plates used in the camera are cut
from very thin plate glass, and are of exactly the same size and thickness so that they
always fit into the sheet metal frames.
Da 1014
Ր
1000
HASELTINE; LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.

page_text: Improvements relating to Photographic Cameras.
I, RUDOLPH KRÜGENER, of Bockenheim, near Frankfort of Main, Germany
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:
My invention has for its object the construction of a photographic secret camera,
the mechanism of which is so arranged that it accurately fits in a casing which
resembles externally in a deceiving manner, the form and the appearance of a book,
and from which neither the objective, the instantaneous cover, nor other inconvenient
parts protrude which might give rise to the belief that there was something else other
than a book therein.
My said invention is illustrated in the accompanying drawing the figures of which
are hereinafter referred to.
The apparatus comprises two main parts, the camera proper, which conceals the
objective cover and plates, and the walls of which are made of sheet metal and the
casing of pasteboard or leather representing the hook. Into the casing the camera
is inserted so that the part forming the backing of the book and containing the
objective opening invariably protrudes.
The camera proper consists of a small sheet metal case the two longitudinal sides
corresponding to the backing and edge of a book are open. The said case is divided,
by two sheet metal strips inserted crosswise into three compartments. The one in
the middle contains the objective, the upper one can be filled with twenty-four glass
plates each of which is placed in a small frame made of very thin sheet metal. They
have a back wall, and the edges bent round and providing a hold for the plate
prevent the coating on the back wall of the next small frame from being rubbed off.
The coated side is turned towards the objective.
A helical spring i presses the small frames backwards firmly against a small board a
which closes one longitudinal opening of the sheet metal case. It is on one side
provided with a depression in the longitudinal direction in such a manner that a
small projecting ridge remains on either side against which the plates are pressed.
In the said depression a slide c moves which carries at its upper end a projecting
metal strip d of about four millimetres broad. To this strip d' which does not quite
protrude to the extent of the cover of a small frame beyond the projecting wooden
ridge is secured a steel rod e carrying a knob f.
If by means of this rod the slide is moved upwards the strip d slides upon the rear
side of the small frame y until, being pressed by the helical spring, it slides down on
the strip d and can then bear against the wooden ridges as the other part of the
slide is placed somewhat deeper than the said ridges. This takes place when the
slide has traversed the whole of its way. The strip d has taken hold of only one
small frame, accordingly it serves so to speak as a hook, for by the ensuing down-
ward movement by means of the rode the sunall frame is displaced into the middle
compartment, that is to say, into the focus.

page_text: The said frame is prevented from falling over by two springs or by two narrow
guide slats.
If it be the first frame, it is supported with its lower end upon the bent
edge of a plate h that carries the helical spring i If after the exposure a second
plate is to be placed in the focus, the slide is pulled upwards. The hook-shaped strip d
takes hold of a fresh plate by means of which the previously exposed plate is moved
from the focus into the lower compartment, after having moved the bent plate ha
little to the interior, or else the small frame, if one was already there, by pressing
upon the knob. In the slit formed the small frame is moved and it can, on the
release of the knob & be moved quite down. This operation is continued until all the
small frames have passed from the upper compartment through the focus to the lower
compartment.
The board a with the slide can be taken out, and the opening serves for filling and
emptying the small frames. Two short pins provided in the sheet metal casing of
the camera, and sunk into the wooden ridges of the boards a prevent the small
frames springing out in the opening. Each of the said frames has upon the back
a continuous number in black upon a white ground.
Through a small window
exposures effected can be controlled.
The instantaneous closing device is placed in the backing of the book-shaped
camera. It is moved between two small boards and u, the latter of which, forming
the outer one, is somewhat curved and constitutes the backing of the book camera,
thereby closing at the same time the second longitudinal opening of the small sheet
metal case.
of red glass which is specially covered by a slide the
As the sensitive plates are only inserted in small frames, and not in boxes, light
would enter the camera in the adjustment of the instantaneous closing device. A
so-called safety slide m has therefore been arranged in the same. This operates in
such a manner that it must be moved quite down, leaving the opening n entirely free,
before the instantaneous closing device is disengaged.
Upon the slide m is secured a small pin o, which when the slide is entirely drawn
up, is pressed against the inclined surface p of a lever q, moving the latter to one
side and disengaging a pin of the drop slide s. The sensitive plates used in the
camera are cut from very thin plate glass, and are of exactly the same size and
thickness so that they always fit into the sheet metal frames.
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
A photographic apparatus, comprising a receptacle which is divided by partitions
into three compartments set in connection with each other and arranged on the side
opposite to the objective, one of the said compartments serving for the reception of a
number of prepared plates, the other for the exposition, and the third for the reception
of the plates that have been exposed in combination with a slide which conveys the
plates from one compartment to the other.
Dotad this 10th day of Santambom 1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicant.