Improvements in Dark Slides for Photographic Purposes.
Year: 1888

page_text: Date of Application, 29th Aug., 1888
Complete Specification Left, 29th May, 1889-Accepted, 29th June, 1889
PROVISIONAL SPECIFICATION.
Improvements in Dark Slides for Photographic Purposes.
I, FRANCIS BEAUCHAMP of High Cross Tottenham in the County of Middlesex
Engineer do hereby declare the nature of this invention to be as follows:-
Improvements in dark slides for this purpose I provide the dark slide with one or
two rollers with pinions fixed thereon working into a rack tho said rollers are provided
with a blind to wind up or down automatically or by hand or a push piece which by
pressing unrolls the blind and covers the plate and when released the blind rolls up
and the plate is exposed the said push piece is provided with an ordinary catch-or
a cord to take the place of the push piece to answer in the same manner. I sometimes
use one or two doors or flaps to open or close inside the camera by moving a lever or
button connected to the door or doors at the side of the dark slide it enables the
operator to expose or cover the plate instantaneously-thus dispensing with the
inconvenience of drawing the dark slide to expose the plate which must be done with
the one now in use. This arrangement entirely prevents any light from entering the
camera the dark slide can be made to carry one two or more plates.
Dated 29th day of August 1888
FRANCIS BEAUCHAMP.
COMPLETE SPECIFICATION.
Improvements in Dark Slides for Photographic Purposes.
I FRANCIS BEAUCHAMP of Hope Cottage Chadwell Heath in the County of
Essex Engineer 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 :--
Improvements in what are known as dark slides for photographic purposes so
constructed that they cannot be drawn from the camera without the plate or plates
being thoroughly covered at the same time dispensing with the inconvenience of the
cover projecting from the camera whilst the plate is being exposed as is done at
present in the old arrangement. According to this invention the dark slide can be
used almost instantaneously with either the blind door or doors. The dark slide is pro-
vided with a blind one end of which is attached to a spindle the other end has two
peices of tape fastened on each corner the said pieces of tape are fixed to another spindle
on the opposite end of the dark slide the said spindle is provided with a spring which
when the catch is released it winds the tape and unrolls the blind and covers the
plate. For exposure the cord is released by a button which comes in contact with
the said catch fixed on the camera thus preventing the dark slide being drawn from
the camera without the plate being entirely covered. Fig. 1.) shows a front view
of the dark slide cut in half showing dotted lines for carrying the plate with the blind
rolled up provided with two cords for rolling and unrolling. Fig. 2) is a end view
of the cord with button attached in dotted lines. Fig. 3) is a end view of the dark
slide provided with a spring and one cord. Fig. 4) is a dark slide provided with two
doors opened and closed by a rack and pinion which can be used in either case.
Fig. 5) is a end view of the same. Fig. 6) is a modification of the same. A is the
blind rolled on its spindle. B is the tape attached to the blind. C is the spindle that
carrys the blind.
Dis the cord for winding or unwinding the same. E in Fig. 2
shows the hole drilled in the spindle in dotted lines through which the cord is
threaded. F in Fig. 3) shows the end of a spring box the dotted lines A is the
blind. C is the spindle. D is the cord. G is a ring which is hooked on to a stud
projecting from the camera to prevent the dark slide being drawn from the camera
[Price 6d1

page_text: without the plate being entirely covered. H is the stud. I. I. in Fig. 4) are two
doors closed. K is the doors lapping each other. L is a crank lever with a horn
piece M on the end which clutches the door. loosely and glides backwards and forward
for opening and closing, as the crank L is not central with the hinges. fixed to the
doors. N is a crank with a slot in the end with a pin working therein the said pin
is fixed to the door to answer the same purpose as the horn peice before described.
P. P are pinions fixed on to spindle Land working into rack A 1. B.1..is the stud for
opening and closing which can be used by spring or by hand. C1. C 1. are two
cranks connected to a lever D 1. to answer the same purpose as the rack and
pinions.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is
1st) A photographic dark slide constructed substantially as described.
2nd) A photographic dark slide substantially as described and illustrated in
Figs. 1, 2, 3, of the drawings hereto annexed.
3rd) A photographie- dark slide with one, two, or more doors substantially as
described.
4th) A photographic dark slide to open or close the mechanism so constructed
substantially as hereinbefore described and illustrated in Figs. 4, 5, & 6 of the drawings
hereto annexed.
34
Ball 1000
FRANCIS BEAUCHAMP.