Apparatus for Exposing Successive Photographic Plates, and for Exhibiting Magio Lantern and other Slides.
Year: 1893

page_text: Date of Application, 8th Dec., 1893-Accepted, 10th Feb., 1894
COMPLETE SPECIFICATION.
Apparatus for Exposing Successive Photographic Plates, and for
Exhibiting Magio Lantern and other Slides.
I, BIRT ACRES, of Clovelly Cottage, Barnet, Herts, Photographer, 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 apparatus whereby a number of slides, such as
photographic plates, magic lantern or stereoscopic slides can be successively
exposed and withdrawn, as I shall describe referring to the accompanying
drawings.
Fig. 1 is a front elevation and Fig. 2 is a plan of apparatus according to my
invention, Fig. 3 is a sectional plan on X X, Fig. 4 is a transverse section on Y Y,
and Fig. 5 a transverse section on Z Z of Fig. 1.
A number of slides or plates P are placed vertically in a kind of hopper
compartment having an inclined bottom B. The front plate P1 is pressed by those
behind it against a fillet F at the top, and at the bottom against a sliding bar S
which has mounted at its one end a horizontal pawl lever L and has its other
end H turned up in hook form to which the fingers can be applied to move the
slide. A screen G of frosted glass, or it might be an opaque screen, is fitted to
slide in mortices above and below and has a projection C on its front in the path
of a pin D and catch E on the slide S. A small roller R facilitates the drop of
the front plate P1 and a spring FI serves to push forward a plate when it has
reached a position in front of it. The apparatus operates in the following
manner.
The slide S being pushed home to the right, the tail of the pawl lever L meets a
fixed tappet T by which the pawl is partly turned so as to project beyond the right.
band edge of the plate Pl.
The slide S being then drawn to the left the plate P' is drawn with it until the
tail of the pawl lever L meets another fixed tappet N by which the lever is
moved so as to disengage the plate which is thus left in the position P.
The slide S being drawn still farther to the left, its catch E meeting C draws
the screen G from behind P' leaving free passage for light, while the plate is
exposed or the slide exhibited.
On now pushing back the slide S, the pin D pushes the screen G to the right
and the pawl lever L engages another plate which has taken the position P¹. On
now pulling S to the left, the fresh plate is advanced to the position of P' the plate
that was there being pushed by it to the left until it comes in front of the spring F
by which it is pressed forwards and can be removed. It is to be understood that
when this apparatus is applied for exhibiting magic lantern slides, the lens tube is
situated immediately behind P3, the hopper for feeding the slides P being fixed on
the one side of the tube, and the space under F' whence the slides are removed
being on the other side of the tube.
When the apparatus is applied for moving photographic plates to the position P'
for exposure, the whole is to be enclosed in a dark chamber.
To prevent the plates or slides in the hopper from falling backwards a loaded
string may be passed round the last of them.

page_text: Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, I declare that what
claim is :-
:―
Apparatus for moving successive plates or slides substantially as described and
illustrated by the drawings.
Dated this 8th day of December 1893.
ABEL & IMRAY,
Agents for the Applicant.