Improvements in Photographic Cameras.
Year: 1889

page_text: Date of Application, 7th Dec., 1889-Accepted, 8th Feb., 1890
COMPLETE SPECIFICATION.
Improvements in Photographic Cameras.
I, OSCAR FREEWORTH of the City of Lenkerbad, County Wallis, Switzerland,
Gentleman, do 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 relates to Photographic Cameras and the manner in which I prefer
to carry my invention into effect is shewn in the accompanying drawings.
Fig. 1 shews the internal parts of apparatus according to my invention.
Fig. 2. shews the outside of same.
Fig. 3. the peculiarly connected frames for sensitive plates.
:
In a box A is arranged the bellows k, which are provided with springs that cause
the bellows to be pressed firmly against the prism which is fixed firmly on a shaft
passing from side to side of the box and ending in the prismatic knob the sides
and edges of which are paralel with those of prism f, so that the position of knob g
is an indication of the prisms position, and the knob serves as a handle for turning
the shaft on which prism f sits.
To each end of prism f is fixed three eccentric dises a which, when the prism is
turned, push against a knob or pin b, attached to the bellows k, in such a manner that
the bellows become contracted.
The frames c are intended to hold the sensitive films or plates and are connected
with each other by means of tapes d, d, so that they can easily be folded and laid on
top of each other.
The lower part of box A is divided into two compartments B and C by means of
partition h.
The manner of working the apparatus is as follows:
The connected frames c, holding the sensitive plates are placed in compartment B,
to do which a slide or door is provided in box A, and the string of frames is
carried over prism f, the three sides of which are the same dimensions as frames c.
When the foremost plate on the string of frames has been brought into the position
where it faces the lens i, the apparatus is ready for work.
The springs connected with the bellows cause the latter to be pressed firmly
against the prism with the frame c which happens to be in position for exposure,
and consequently, when the cap is removed from the lens no light can enter behind
the prism and the rays only strike the exposed plate.
When exposure is finished, and it is desirable to bring another sensitive plate into
position for exposure, the knob g, on the outside of box (fig. 2) is turned and with
that of course prism f and discs a, one pair, one at each end of prism, press against
the pin b, of which there is a similar one on the opposite side of bellows, and not
visible on drawings. This pressure on pins 6 causes the bellows k to contract and
release their pressure against the prism, thus enabling the latter to be turned and
expose another plate.
In the drawing plate c has already been exposed and is hanging downwards in
compartment C, plate c¹ is ready for exposure and next will follow plates c², cử
and so on according to the number of plates stringed together in the manner
described.
Ultimately all the plates will have passed the exposure position and deposited
themselves on top of each other in compartment C, just as they were originally placed
n compartment B, except of course that the plate which was underneath before will
now be uppermost. A door or slide m in box A permits of the plate-frames being
emoved from compartment C.

page_text: Instead of an ordinary cap on lens i, I generally provide an instantaneous shutter
of the well-known kind and which I generally fix on the inside of box.
My apparatus is also applicable to sensitive paper, in which case the frames c are
replaced with roller on which the paper is rolled up and the edges of prism f. are
then provided with little pins to prevent the paper from sliding.
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. In Photographic Cameras the arrangement consisting essentially of a prism f
and eccentric discs a which, when the prism is turned force the bellows, which are
held firmly against the prism by means of springs, away from the prism, substantially
in the manner as and for the purpose described.
2. In connection with the arrangement described in the above claim, the employ-
ment either of plate or film-frames c connected with each other, or, in case of
sensitive paper, of rollers substantially in the manner as and for the purpose
described.
подион, тип весенное 1007.
'OSCAR FREEWORTH.
Per C. R. Bonne & Co.,
41, Eastcheap, his Agents.
FREEWORTH.
'OSCAR
Per C. R. Bonne & Co.,
41, Eastcheap, 'his Agents.