Improvements in Photographic Cameras.
Year: 1890

page_text: Date of Application, 23rd Dec., 1890
Complete Specification Left, 23rd Sept., 1891-Accepted, 21st Nov., 1891
PROVISIONAL SPECIFICATION.
Improvements in Photographic Cameras.
We KARL FERDINAND JEKEL1, Chemist, of Ottakring, Saillergasse 23, near
Vienna Austria, and JOSEF HORNER, Merchant, Stuckgasse 6 Vienna Austria, do
hereby declare the nature of this invention to be as follows:-
:-
Our invention relates to improvements in photographic cameras and relates more
particularly to that class of apparatus known as demon or detective cameras, by
means of which an instantaneous negative can be taken by the user of the apparatus,
without attracting the notice of surrounding persons.
According to our invention we apply our improved camera to a hat of any
suitable size or shape, and we form for that purpose two circular perforations in
the crown of such hat while we provide the same with an opaque lining. Within
the body of the hat we arrange a suitable extensible and collapsible frame, within
which the box or camera proper containing the sensitized plates is fixed. This
frame consists of an upper and lower horizontal support, the latter of which carries
at each end an upright, terminating by a triangular and spatula shaped end to
which is articulated by a pin or pivot, the lower and similarly formed part of a.
hook, the lowermost end of which is connected to the base of the upright by a
spiral spring. Two long bell crank levers are secured at one end to the said hooks,
and at the other to one extremity of two long spiral springs the other and cranked.
ends of which are connected to the extremities of the upper support above
mentioned.
The object glass is suspended in front of the largest of the two circular per-
forations formed as above stated in the crown of the hat, this suspension being
carried out by means of a tapped ring or collar furnished with flanges, which are.
fixed in any suitable manner to the crown of the hat close to the edges of the large-
opening. The object glass is screwed within this ring, being held therein by a
small screw, and it is further connected to a vertical tube, closed at the top with the
exception of a small central aperture through which passes a pin terminated by a
small knob, on depressing which, the camera is actuated and the photograph is
instantaneously taken. The said vertical tube passes through the small perforation-
formed in the crown of the hat, and is furnished outside the same with a removable
knob, its lower end passing through an obturator plate or excentric, which turns
upon the said tube as axis in and out of the tubular frame of the object glass, and
has a circular opening, which as it coincides with the inner part of the said object.
glass, allows of a negative being taken. The motion of this obturator, upon its
axis is limited by two pins, two perforations being likewise formed therein for the
purpose of fixing the said obturator in its closed and in its open position, that is
to say when in the latter case an ordinary in contradistinction to an instantaneous
photograph is required. A spiral spring is coiled above the obturator upon the
lower part of the vertical tube aforesaid, to which one of its ends is attached
while its other end bears against the tubular frame of the object glass and has a
tendency to move the obturator plate.
In the above mentioned perforations of the latter plate, can enter a nipple formed
upon.a
curved spring one end of which is screwed to the tubular frame of the object
glass, while the other end is bent under the lower end of the vertical tube aforesaid
so that by pressing on the knob of the before mentioned pin which moves through
the vertical tube the bent end of the said spring is depressed and its nipple is conse-
quently removed from the perforation in the obturator plate.
Dated this 22nd day of December 1890.

page_text: COMPLETE SPECIFICATION.
Improvements in Photographic Cameras.
We, KARL FERDINAND JEKELI Chemist, of Ottakring Saillergasse 23 near
Vienna Austria and JOSEF HORNER Merchant, Stuckgasse 6 near Vienna Austria
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-
:
This invention relates to photographic apparatus for use in connection with hats,
caps, and the like. According to the said invention a covering for the head is
provided with an objective so as to constitute-a-photographic apparatus, the camera
of which is formed "by a lining which does not permit the passage of light by the
case held in a frame.
In the accompanying drawings
Fig. 1 represents a section of a hat arranged in this manner.
Figs. 2 to 4 are interior views of the objective the shutter being shown in its
three different positions.--
Fig. 5 shows the outside of the objective with the shutter in the position Fig. 4.
Fig. 6 is a.transverse section on the line - of Fig. 4, as seen in the direction
of the arrow .
Fig. 7 is a side elevation of the objective in the position Fig. 5.
Fig. 8 is a transverse section on the line y-y of Fig. 3, as seen in the direction
of the arrow, y the spring locking arm g being modified.
Fig: 9 shews a transverse section of the sliding case serving for the reception of
the sensitized plate (dry plate).
Fig. 10 is a detail.
In the opening formed above in the centre of the hat is fastened a ring or
tubular piece which-receives the objective held in the latter by means of screw
threads or a simple bayonet joint.
The objective c, which may be of any desired construction, is provided with a
shutter d which is adapted to be turned upon an axis e outside said objective.
This axis is hollow, and through it passes a pin which protrudes above from
the hat and presses below against a spring arm which engages by means of a
pingwith-a-hole-in-the-shutter d-and-arrests-the-latter.-
A spring surrounding the aforesaid axis e is fixed at one end to this axis and at
the other end to the objective cand tends to turn the shutter d in one direction.
The lining e of the hat consists of a material which does not permit-the-
passage of light through the same, and has at its upper part a frame k designed for
the reception of the case.
When the apparatus is to be used the covered sensitized plate (dry plate) or
the case which receives the same, Fig. 9 is simply placed in the rectangular frame k
and secured by means of the gags on the lateral parts of the frame or in any
other appropriate manner.
Then the frame k is moved from the position shown in dotted lines to that shown
in full lines Fig. 1, thereby converting the lining and hat into a camera. After
-this-the-shutter-d-is-moved to the position (Figs. 4 and 5) by turning the axis e
through the medium of the knob e' accessible from the outside, and is fixed by the
ping on the spring arm g which engages with the hole d2 in the said shutter d.
The sensitized plate (dry plate) is now uncovered by pulling away the slide so
that the exposure can take place. This is effected as soon as pressure is exerted
upon the pin to lift the arm y far enough from the shutter d for the pin g¹ to leave
the hole whereupon the released shutter d is turned by the spring h in the direction
of the arrow (Figs. 4 and 5). In this rapid movement, a round aperture or a slot d¹
in the shutter d passes the aperture in the objective c to cause at this moment the
exposure of the sensitized plate (dry plate).
In the case of instantaneous exposures the shutter d is moved from the position

page_text: Figs. and 5 to that of Fig. 2 so that only during the short time when - the
aperture d in the shutter d passes the aperture in the objective an exposure will
take place therefore the time of exposure depends on the length of the aperture d'
For obtaining long exposures or for making observations the shutter d is turned
only such a distance that the aperture in the same coincides with the aperture in
the objective when the pin g on the spring arm g engages with a second hole d³
in the shutter d and retains it in this position as shown in Fig. 3.
In order to enable the time of the instantaneous exposure to be lengthened at
will, use is made of the modified arrangement in which an arm g' carrying a locking
pin g is combined with the arm g.
If in this arrangement the pin is pushed towards the interior only to such an
extent that the arm g is solely taken off and its pin g' is removed from the hole d²
the pin g on the arm g², in the turning movement of the shutter d from the position
(Figs. 4 & 5) to that shewn in Fig. 3 at the moment when the aperture d² in the
shutter d coincides with that in the objective, will engage with a hole d³ in the
shutter d and retain the latter in the position for exposure (Fig. 3). After
the exposure or observation the pin is pressed still further towards the interior,
so that it will also take off the arm g² thereby liberating the pin g and enabling
the released shutter d-to pass from the position (Fig. 3) to that of Fig. 2.
The movement of the shutter d is limited by the pins d' d' which in the extreme
positions of the said shutter bear against casing of the objective and prevent the
further turning movement.
'
When the apparatus is not used the exterior aperture of the objective is closed
by a cover and the knob e' may be unscrewed and removed together with the
pin f. The upward and downward movement of the latter is limited by its exterior
head and a projection provided in the interior.
The frame can be held in the upper and lower position by jointed levers m m¹
and a spring m
The spring m³ is connected on the one hand with the lever m', and on the other
hand with the three-piece m³ of the second lever m. The lever m consists of two
parts which are connected by a sleeve m', into which their extremities are screwed,
in such a manner that by screwing them more or less into the muff m* the length
of the lever m can be varied and the tension regulated.
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 I
claim is:-
(1) A photographic apparatus for use in connection with a hat, cap, or the like,
in the upper part of which, the objective is provided, whilst a lining which does
not allow the passage of light through the same, receives the frame for the plate
or case and forms with the said hat, cap, or the like, a camera.
(2) In photographic apparatus for use in connection with hats, caps, or the like,
the employment of an objective to be used with a perforated shutter d adapted for
instantaneous and long exposures, which shutter can turn upon a hollow axis e,
and is held in the required positions by means of one or two spring arms 7 or g², the
pins g or g³ of which engage with corresponding holes d² d³ in the shutter; a pin f
accessible from the outside and extending through the hollow axis e effecting the
release of the shutter d if pressed against the arm g.
(3) For retaining the camera in the distended or folded position, the arrangement
of jointed levers m m³ with a spring m² the lever m being made of two parts which
can be screwed more or less into a connecting sleeve m* for the purpose of changing
the length of the lever m."
Dated this 02nd day of Santambos 1001
RAYNER & CASSELL,
37, Chancery Lane, W.C., Agents for the Applicants.