PHOTOGRAPHIO DARK SLIDE FOR NEGATIVES ON PAPER
Year: 1885

page_text: ALFRED P SHARP Marble Mason 17 Great Brunswick Street Dublin do hereby
declare the nature of invention for PHOTOGRAPHIO DARK SLIDE FOR NEGATIVES
ON PAPER to be as follows:-
This dark slide or carrier made of wood to fit any photographic camera, the
sensetized paper or other fabric being used in a continuous length, is worked on
rollers, one to receive the exposed negative, and one to hold the sensetized paper
or other fabric, by turning a key on the outside, the exposed part is coiled on one
roller, and a fresh portion is brought into position for next exposure, the paper is
measured into proper lenghts for each negative before being coiled on roller and a
small slot is cut at each lenght, into this slot a small wire spring drops to indicate
where each negative terminates, as this spring is seen on top of slide, there is a
thin board arrainged at back of the part of paper for exposure, to keep it flat, and
small springs are used to work on flanges of rollers to keep a tenison on the paper,
by this means from fifty to one-hundred negatives can be taken by simply turning
the key on outside of carrier, saving the nessesity for a dark changing tent or other
incumberance and all the weight of plates.

page_text: I, ALFRED PETER SHARP, of 17, Great Brunswick Street, Dublin, Marble Mason,
do hereby declare the nature of my invention for A. PHOTOGRAPHIC DARK SLIDE
FOR NEGATIVES ON PAPER, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:
This invention has reference to photographic dark slides, and has for its object
the carrying and charging of sensitized paper, film, tissue, or other suitable material
for taking photographs.
The invention consists of two parts-(1) an outer case or shell made to fit the
photographic camera in the same manner as the ordinary dark slide; and (2), nn
inner part made of wood and ebonite or other suitable material, and constructed as
follows: On a suitable frame a flat piece of ebonite with curved ends is arranged,
over which the sensitized paper slides, and in front of this plate of ebonite is also
arranged a plate of glass of same dimensions, so that the paper will pass between
it and the ebonite plate, thereby ensuring a perfectly flat surface. At one end of
the frame and at the back of the ebonite plate a receiving roller is fitted, and at the
other end a measuring roller; and between these two rollers is placed the con-
tinuous coil of sensitized paper. One end of receiving roller is provided with a
square screw centre to take a key applied from outside the case for the purpose of
turning the roller. The measuring roller is also provided with an indicator―
preferably one to indicate by sound-whereby the quantity of paper uncoiled will
be readily indicated to the photographer. A spring roller is arranged to act in
conjunction with the measuring roller for the purpose of keeping the paper in
contact with the latter.
In order that my said invention may be more readily understood and carried
into practice, I will describe the accompanying drawings:-Fig. 1 is a plan, partly
in section, of my improved dark slide, viewing same from the rere or inner side;
fig 2 is a longitudinal section on line a. x, fig 1; and fig. 3 is a side view.
Similar letters indicate corresponding parts in each of the views: A A represents
the outer case or shell, and B.B the frame of inner part, c c (fig. 2) shows the flat
piece of ebonite with curved ends, and d d the plate of glass, between which and
the ebonite the sensitized paper e slides. fis the receiving roller provided with a
slot for the reception of the free end of the paper. g is the measuring roller
over which the paper passes, and by means of which, through the intervention of
the indicator h, the length of paper paid out is indicated: two revolutions of this
roller register a length of paper for each exposure. k represents the loose coil of
paper or other suitable material, which may be inserted in the frame with or
without a loose roller. is the spring roller which is caused to impinge against
the roller g by the springs, for the purpose of ensuring the proper paying out of
the paper and its contact during such paying out with the measuring roller.
p shows the ratchet wheel and pawl attached to the spindle of the receiving roller,
to which a key p¹ is applied from the outside for the purpose of turning the receiving
roller. This roller is turned until the indicator h announces two revolutions, of the
measuring roller, when it will be obvious the proper length of paper is drawn
between the plates of glass and ebonite for an exposure.

page_text: A small springs is carried by the outer case, one end of which is acted upon by
a stud suitably placed on the back of the cover; so that in the act of drawing the
cover the upper end of the spring will be caused to impinge against the paper,
marking or piercing same, and thereby enabling the operator to see where to
separate the paper for development.
It is obvious that the arrangement herein described may be used either loogi-
tudinally or transversely, as may suit the photographer's convenience.
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
1. In a dark slide for photographic purposes, the arrangement of a coil of paper
whereby the same can be used with or without a loose roller, substantially in the
manner herein described and set forth.
2. The use of the spring roller in combination with the measuring roller g, sub-
stantially for the purpose and in the manner specified.
3. In a photographic slide, the method whereby a perfectly flat surface of the
paper is obtained without tension, substantially in the manner herein described
and set forth.
4. The method of fixing the free end of the paper to the receiving roller by
threading through a slot fi formed in roller, substantially as herein specified.
5. In a dark slide, the method of causing the paper to be automatically marked
by means of a springs in the act of opening or drawing the cover of the slide,
substantially as described and set forth.
ca
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