Improvements in and connected with Photographic Apparatus.
Year: 1892

page_text: Date of Application, 3rd Feb., 1892
Complete Specification Left, 3rd Nov., 1892-Accepted. 31st Dec.
1802
PROVISIONAL SPECIFICATION.
Improvements in and connected with Photographic Apparatus.
I, EDWARD SLEDGE, of 46 Rural Vale Northfleet in the County of Kent,
Photographer do hereby declare the nature of this invention to be as follows :—
My invention relates to a device to be used in connection with an ordinary
photographic camera.
In carrying my said invention into effect I make an opening in the end of the
dark slide to which an attachment herein called the receiver is securely fastened.
Said receiver is constructed with its sides curved outwards, so that a bag
containing spare plates may be readily attached thereto, in any convenient manner.
The curved mouth of the receiver will also facilitate the admission of plates into
the dark slide.
In order that all light may be excluded, I provide a long sliding piece which
slides within grooves, and covers the opening in the dark slide when pushed
thoroughly into its place. When it is desired to pass a plate through said opening,
the aforesaid sliding piece can be pulled out by taking hold of a pin or the like,
provided for the purpose.
A plate carrier may be used in connection with the before mentioned bag, having
grooved or corrugated sides for the purpose of holding the plates, and preventing
them from getting scratched or otherwise injured, also for convenience in changing
said plates. This carrier is preferably made with its sides separate from one
another but attached to the inside of the bag; in this case suitable fastenings or
clasps are provided for securing the sides rigidly together when so required.
The receiver together with the sliding piece, and also the plate carrier may
be made of any suitable metal or material. The bag is preferably made of water-
proof cloth, but I do not confine myself to any particular material nor size in any
of the aforesaid parts.
Dated this 8th day of January 1892.
FREDK. WALKER,
11, Furnival Street, Holborn, London, E.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in and connected with Photographic Apparatus.
I, EDWARD SLEDGE of 46 Rural Vale Northfleet in the County of Kent,
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 :-
My invention relates to a device to be used in connection with an ordinary
photographic camera & has for its object a more rapid & inexpensive way of
changing the plates of the dark slide of the said photographic camera.
means, moreover the use of more than one dark slide is obviated.
By its
In carrying my said invention into effect, I make a slotted opening the width of
the plate in the end of the dark slide. Over this opening, & securely fastened
thereto to prevent the admission of light is fixed an attachment called a receiver.
The said receiver is made of brass or some similar metal & possesses a mouth-
piece with lips curving outwards so that a lightproof bag may be attached thereto
for the purpose of introducing plates for exposure & removing the said plates
from the dark slide, after exposure, without the operator being compelled to make
use of a dark room where he can open the slide in the usual manner. In order to
Price 8d1

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prevent ingress of light when the bag is remove, a long sliding piece working
within grooves in the receiver, below the mouthpiece, covers the slotted opening in
the dark slide when the bag is not attached. When it is desired to introduce or
remove plates, the aforesaid sliding piece can be pulled out by means of a lug, pin
or the like, after the aforesaid bag is attached. Although for the purposes of
description I have mentioned a bag for carrying the plates, I do not confine myself
to the use of a bag; any suitable receptacle for containing plates can be employed,
for example:-
-a box having two suitable slotted openings corresponding to the
opening of the mouthpiece of the receiver of the dark slide, the mouthpiece of the
receiver of the latter, being of course slightly modified for this purpose, the lips of
the said mouthpiece being arranged to slide in corresponding grooves in a small
metal receiver fixed on the box, or plate holder, as shewn in Fig. 2, the said box
being also provided with a sliding piece, similar to that on the mouthpiece of the
dark slide receiver, to prevent the access of light.
The opening at one end of the box serves for introducing the plates into the dark
slide & the one at the opposite end for receiving the plates after exposure in the
dark slide.
In order to prevent the plate being scratched or frayed during the process
of transferring, small rollers or lugs are fitted to the corners of the slotted mouth-
piece so that the plate may only bear on its edges.
In the drawings Fig. 1 is a sectional front elevation, shewing the dark slide and
receiving box with their respective mouthpieces and slides.
Fig. 2 is a side elevation of the same.
Fig. 3 is a plan of the receiver.
A. is the dark slide.
B. is the box containing the plates.
C. is the metal receiver attached to the dark slide.
D. is the metal receiver attached to the box containing the plates.
E&E, are the two slides for preventing ingress of light.
F&F are the lugs or rollers upon which the edges of the plates slide.
G&G, are pins for preventing the slides being drawn out too far.
The drawings are best explained by describing the process of charging the dark
slide with plates for exposure, & of removing the said plates after exposure.
In order to charge the dark slide, the box B, containing the plates, is attached
to the dark slide A, by sliding the edges of the metal receiver C, of the dark slide,
into the mouthpiece D, of the box B...
The slides E, & E are then drawn out so as to allow the plate or plates to drop
into the dark slide. The slides E & E, are then pushed back again, when the box
containing the plates can be removed.
After exposure, the plates are removed by attaching the dark slide as before
to the other slotted opening in the opposite end of the box. The slides are
then drawn out as before, (the box for holding the plates being underneath the
dark slide), & the plates allowed to drop in the box.
Having now particularly described & ascertained the nature of my said inven-
tion & in what manner the same is to be performed, I declare that what I
claim is:
1. The manufacture & use of an attachment for dark slides of photographic
cameras, for the purpose of introducing & removing plates from the dark slides
in open daylight, substantially as hereintofore described.
2. The use of a lightproof bag or other suitable receiver as hereintofore
described, in conjunction with a slotted receiver fitted to the end of an ordinary
.dark slide, substantially as above described.
Dated this Thi of Naomben