A Photographic Dark Slide of an Improved and Simple Construction.
Year: 1886

page_text: A Photographic Dark Slide of an Improved and Simple
Construction.
WILLIAM TYLAR, 31 Yates St Aston Rd Nth, Birmingham Preparer of Micro-
scopic objects and dealer in Scientific apparatus and Commission Agent do hereby
declare the nature of this invention to be as follows:-
My invention consists of two shallow cases or trays for holding the sensitive
plates, papers or filins, each case having a separate sliding shutter, which is self
locking, and cannot be pulled or shaken past its proper position. The said cases or
trays are capable of being affixed to each other by a sliding or other device for
this purpose, thus forming a double dark slide which is ecenomical, effective,
unbreakable, secure from accidental opening, unafected by climate and always true
to its proper position in the camera.
They can be made of any size and affixed to any form of camera.
COMPLETE SPECIFICATION.
A Photographic Dark Slide of an Improved and Simple
Construction.
I, WILLIAM TYLAR of 31 Yates St. Aston Rd Nth Birmingham dealer in Micro-
scopic Slides & Materials and commission agent do hereby declare the nature of my
invention for AN IMPROVED AND SIMPLE FORM OF METAL DARK SLIDE and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :—
My dark slides consist of two shallow metal cases or trays Fig. 1 and 2 each
fitted with a inetal shutter sliding in a light tight groove The mode of constructing

page_text: this light tight groove is as follows Fig. 4 represents a portion of the metal
stamping having 2 projecting pieces left at A A for the purpose of bending over
and firmly holding a piece or pieces of cloth, India Rubber or other suitable pliable
material These pieces of metal when tightly pressed down on the edges of the
aforesaid pliable material causes a bulging up in the centre.
This bulging portion presses closely against the metal shutter and prevents the
ingress of light. This mode is applicable to both sides of the groove.
The shutter is self locking and cannot be pulled out of the slide. This is
effected thus, The shutter is stamped in one sheet and has left two projecting
corners on the bottom edge as shewn in Fig. 5. C. C. This shutter is inserted in
the light tight grooves above mentioned, the ends of which are then plugged by
means of a piece of metal, which prevents the shutter from being pulled too
far out.
While the portions left by this plugging of the grooves at Fig. 2. D. D. keep the
slide in its proper position in the camera and securely retains it during exposure.
The 2 cases or trays are placed together one having a band of metal which drops
in a corresponding groove, Outside this groove are soldered some pieces of metal
tubing for the reception of the wire as at Fig. 3 and by which means they are
securely held together and thus form a light tight dark slide for the exposure of
two sensitive surfaces or films.
The number of tubes vary according to the sizes of the dark slides.
A leather tag is attached to each shutter for convenience of pulling out.
Having now particulary 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. A means of making a light tight groove for metal dark slides.
2. A self locking shutter which cannot be withdrawn from the dark slide,
constructed from one piece of metal.
3. A means of keeping the dark slide in proper position in the camera and
preventing its accidental withdrawel from the camera while exposing.
4. And a method of fastening the component parts of the slide by means of a
wire inserted through tubes.
Dated this 16th day of August 1886.