Improvements in Reducing-cameras for Lantern Slides.
Year: 1889

page_text: Date of Application, 2nd Dec., 1889
Complete Specification Left. 1st Sept.. 1890-Accepted, 25th Oct., 1890
PROVISIONAL SPECIFICATION.
Improvements in Reducing-cameras for Lantern Slides.
I, ARTHUR PEARSON, of 5 New Station Street, Leeds, Yorkshire, Dealer in
Photographic Instruments, do hereby declare the nature of this invention to be as
follows:-
-
My invention has reference to reducing cameras for lantern slides, and consists,
Firstly. In constructing the end of the camera (where the negative is placed) so
that the said negative can be adjusted in its position either horizontally, vertically, or
diagonally. To enable me to do this I preferably employ flat springs, one arranged
at each corner of the camera, for the purpose of holding the negative in any required
position, and when more or less of the picture is required to be exposed, the negative
can readily be adjusted or moved from one position to another, which cannot be done
with the present construction of camera, consequently a long felt want is supplied.
Instead of employing the flat springs for holding the negative, other equivalent devices
may be substituted.
:
Secondly. In the present construction of cameras, there is always some difficulty"
in getting access to the lens. To obviate this I divide the camera into two parts,
connected together by a suitable form of slide, between which parts there is a space
left, giving free access to the lens. The space left between the divided camera is
covered over by the focussing cloth for the purpose of darkening the camera, rods
or projections being employed to suspend the said focussing cloth. The reducing end
of the camera is also lessened in size and made to the size of plate to be used,
the object being to economise room, reduce the cost, and make the camera more
portable.
Dated this 30th day of November 1889
TASKER & CROSSLEY,
Halifax, Agents.
COMPLETE SPECIFICATION.
Improvements in Reducing-cameras for Lantern Slides.
I, ARTHUR PEARSON, of 5 New Station Street, Leeds, Yorkshire, Dealer in
Photographic Instruments, 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 reference to reducing cameras for lantern slides and consists,
Firstly. In constructing the end of the camera (where the negative is placed) so
that the said negative can be adjusted in its position either horizontally, vertically, or
diagonally. To enable me to do this, I preferably employ flat springs, one arranged
at each corner of the camera, for the purpose of holding the negative in any required
position, and when more or less of the picture is required to be exposed, the negative
can readily be adjusted or moved from one position to another, which cannot be done
with the present construction of camera.
Fig. 1 of the accompanying drawings represents a geometrical view of my
improved reducing camera, to which are attached springs A made from flat pieces
of steel or other suitable metal. B is the negative holder or frame, kept in position
by the said springs A, but the said negative holder can be adjusted in any required
position, to adapt itself to the picture, so as to expose more or less of the said
picture as required, and as will be readily understood; by which means a long felt
want is provided for. Instead of employing the flat springs for holding the negative,
other equivalent devices may be substituted.

page_text: Secondly. In the present construction of cameras, there is always some difficulty
in getting access to the lens. To obviate this I divide the camera into two parts,
connected together by a suitable form of slide, between which parts there is a space
left, giving free access to the lens.
This part of my invention is also shewn in Fig. 1, where it will be seen that the
camera is divided into two parts C and D connected together by the horizontal
rods E, also by means of one or more projections on the underside of the parts CD
working in dovetail or other form of groove F formed in the board on which the
camera rests. The lens occupies the usual position in part G, which can now be
easily got at. The space between the parts of the camera C and D may be covered
over by the focussing cloth for darkening the camera, the said cloth resting upon the
horizontal rods E. The reducing end of the camera is also lessened in size and
made to the size of plate to be used, the object being to economise room, reduce the
cost, and make the camera more portable. The focussing end of the camera C is
provided with a rack H and pinion operated by the milled screw I; but a milled
screw and washer may pass through the part J and bound against the V bed K so
as to keep the focussing end in position after adjustment in the ordinary and well
known manner.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is :-
:-
Firstly. In reducing cameras, the use of springs A or like equivalents for keeping
the negative frame or holder in position and allowing adjustment of same, substantially
as described.
Secondly. Dividing reducing cameras in two parts such as C and D for the purpose
of giving free access to the lens, as described.
Thirdly. In reducing cameras divided into two parts, the combination therewith of
guide rods such as E employed in the manner and for purposes set forth.
Dated this 30th day of August 1890.
TASKER & CROSSLEY,
Halifax, Agents.