Improvements in Photographic Dark Slides.
Year: 1891

page_text: Date of Application, 23rd Mar., 1891
Complete Specification Left, 16th Oct., 1891-Accepted, 21st Nov., 1891
PROVISIONAL SPECIFICATION.
Improvements in Photographic Dark Slides.
I, WILLIAM TYLAR, of 57 High Street, Aston New Town, Birmingham, int he
County of Warwick Manufacturer, do hereby declare the nature of this invention
to be as follows
This invention relates to improvements in photographic dark slides, and its
primary object is to provide an improved combination of the plate carrier with the
slides; to provide improved means for the better prevention of access of light to
the enclosed plate, and to provide an improved method of securing and carrying
the cloth (or similar substance) forming the mouth of the slide groove, &c.
This my invention is intended more particularly for metallic slides, but parts of
which may be also applied to wooden slides. I shall therefore describe it as applied
to metallic slides.'
The back of the frame is recessed to receive the plate and plate carrier. At the
one end of such recess is formed a hinged joint, to which is hinged the one end of
the plate carrier, so that when the plate is inserted, the whole may be laid down
compactly in the said recess, permitting the free passage of the slide thereover.
This said frame is cut from one piece of metal, having its edges turned down at
right angles, to a depth about equal to the thickness of the plate, for the
strengthening of the same, and thereby also forming a recess into which the plate is
placed. Small clip like portions or their equivalents may also be formed at the
edges, at the top, sides or bottom, to retain the plate therein.
In constructing the frame of the slide --Within the slide groove entrance, it is
usual to provide upon the top and bottom surfaces, layers of cloth or other similar
substances, which, at each end terminate in a diagonal form to accommodate the
usual shape of slide. In such cases however, a small portion of light is liable to
pass down at the extreme end, unless protected by soldering &c. In my arrange-
ment however, I provide that the said cloth surfaces shall extend right to the
extreme edges, such extended portions lying loosely, and provide that the slide
shall be of a continuous width equal to about the width of the said opening or
entrance.
In order to still further prevent light from penetrating into the interior along
the edges of the slide frame; provide that the said part containing the cloth
surfaces shall extend beyond the width of the slide, that is, that the union of the
back and front plates forming the frame, shall be nipped in or closed together, to a
width less than what the shrinkage &c. of the said cloth parts may be, so that even
if any light could penetrate down along the sides of the slide it would be arrested
at the end of the said cloth parts.
Also in order to keep the front of the slide frame as flat as possible, I provide
that the rear plate upon which the one piece of cloth is carried, shall be slightly
recessed to receive it, the edges of the said cloth pieces being suitably clipped and
held by the metal being turned over.
TL01 den of March 1901
CHARLES T. POWELL,
Applicant's Agent.

page_text: COMPLETE SPECIFICATION.
Improvements in Photographic Dark Slides.
I WILLIAM TYLAR, of 57 High Street, Aston New Town, Birmingham, in the
County of Warwick, Manufacturer, 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 :-
This invention relates to. improvements in photographic dark slides, and its
primary object is to provide an improved combination of the plate carrier with the
slide to provide improved means for the better prevention of access of light to
the enclosed plate, and to provide an improved method of securing and carrying
the cloth (or similar substance) forming the mouth of the slide groove, &c.
By way of explanation, I would here remark that by the term slide I refer to
the article described as a whole.
At
The back of the frame is recessed to receive the plate and plate carrier.
the one end of such recess is formed a hinged joint, to which is hinged the one end
or side of the plate carrier, so that when the plate is inserted, the whole may be
laid down compactly in the said recess, permitting the free passage of the sliding
shutter thereover. This said frame is cut from one piece of metal, having its edges
turned down at right angles, to a depth about equal to the thickness of the plate,
for the strengthening of the same, and thereby also forming a recess into which the
plate is placed.
Small clip like portions or their equivalents may also be formed at the edges, at
the top, sides or bottom, to retain the plate therein.
:―
In constructing the frame of the slide Within the slide groove entrance, it is
usual to provide upon the top and bottom surfaces, layers of cloth or other similar
substances, which, at each end terminate in a diagonal form to accommodate the
usual shape of slide.
In such cases however, a small portion of light is liable to pass down at the
extreme end, unless protected by soldering &c. In my arrangement however, I
provide that the said cloth surfaces shall extend right to the extreme edges, such
extreme ends lying loosely, and provide that the slide shall be of a continuous width
equal to about the width of the said opening or entrance.
In order to still further prevent light from penetrating into the interior along the
edges of the slide frame; I provide that the said part containing the cloth surfaces
shall extend beyond the width of the slide, that is, that the union of the back and
front plates forming the frame, shall be nipped in or closed together, to a width
less than what the shrinkage &c. of the said cloth parts may be, so that even if any
light could penetrate down along the sides of the slide it would be arrested at
the end of the said cloth parts.
Also in order to keep the front of the slide frame as flat as possible, I provide
that the rear plate upon which the one piece of cloth is carried, shall be slightly
recessed to receive it, the edges of the said cloth pieces being suitably clipped and
held by the metal being turned over.
In order to more particularly explain how this my invention is to be performed,
I have appended hereunto illustrative sheets of drawings, upon which are figures
and numbers of reference, similar numbers referring throughout the several views
to the same thing or part, and in which ;-
Fig. 1, is a face plan view, and Fig. 2, a rear plan view of this my improved
slide.
Fig. 3, is a front view of the slide with the shutter slide partly opened.
Fig. 4, is a sectional view of Fig. 1, at A,-B showing the plate carrier opened
for the reception or removal of the plate.
Figs. 5, 6, 7 & 8, illustrate a modification in the method of carrying and securing
the plate in the recess of the slide.

page_text: Fig. 7 also, and Figs. 9 & 10, illustrate the method of the disposition of the cloth
surfaces at the shutter slide entrance to prevent access of light thereat, in Fig. 7, a
portion of the front plate, front cloth, and of the sliding shutter being removed in
order to show the cloth..
Referring to Figs. 1 to 4 :-1, is the back plate of the frame which is recessed
at 2, to receive the photographic plate 3, and plate carrier 4. At 5, is formed a
hinge joint to which is hinged the plate carrier 4, so that when the photographic
plate is inserted, the whole may be laid down compactly in the recess 2. This
plate 1, is stamped from one piece of metal, and the depth of the sides of the recess
is sufficient to allow of the thickness of the photographic plate and its frame lying
therein. A front plate 6, is secured to the back plate 1, having its edges 7, 7, 7,
turned over on to the former, and thereby mainly completing the frame.
In some instances provision is made for the plate 3, to be passed into the carrier
in the direction of the arrow (Fig. 4) in which case I may provide small clips 8,
(see Figs. 3 & 4,) for the purpose of retaining the said plate therein, or, usually
the plate would be dropped into its place, and the slide turned upside down while
the carrier was being closed into the recess.
.
Referring to the modification illustrated in Figs. 5, 6, 7 & 8 :-Instead of the
carrier consisting of a rectangular frame form as in Figs. 1 to 4, I make a
projection 9, which is secured to the recessed part of the frame, and at the opposite
side thereto provide the hinge joint 10, which, when the plate is passed into the
recess, is turned down thereon.
In Figs. 7, 9 & 10, I have illustrated my method of securing the cloth surfaces
at the entrance for the sliding shutter 11. To the front plate 6, is secured the piece
of cloth 12, and to the plate 13, which is secured to the back plate 1, is the piece
of cloth 14.
These pieces of cloth are held down by the edges of the metal being turned over
thereonto. Along the front edges they are thus held down the whole of their
width, while upon their inner edges they are so held down for a distance about
equalling the width of the photographic plate, which thus leaves their ends from 15
to 16 (see Fig. 7) loose.
In order to still further prevent light from penetrating into the interior along
the edges of the sliding shutter and the frame; I provide that the said part
containing the cloth surfaces shall extend beyond the width of the slide 11, and
that the union of the back and front plates forming the frame, shall be nipped in or
closed together, from 17, to the end (see Figs. 6 & 8) to a width less than what
the shrinkage &c. of the said cloth parts may be, so that even if any light could
penetrate down along the sides of the shutter, it would be arrested at the end of the
said cloth parts.
Also in order to keep the front of the slide frame as flat as possible, I provide
that the rear plate 1, at 18, (see Fig. 10) upon which the one piece of cloth 14, is
carried, shall be slightly recessed to receive it, the edges of the said cloth pieces
being suitably clipped and held by the metal being turned over. As will be seen
from Fig. 10, I preferably carry the cloth 14, on a separate metallic plate, and
solder or rivet it to the main back plate 1.
Although for the sake of explanation, I have shown and described the retaining
projection 9, (Figs. 7 & 8), and also shown and described the holding of the cloth
pieces 12 & 14, by the turning over of the metal edges thereonto, I wish it to be
understood that I do not claim these parts or method as being new, but :-
Having now particularly described and ascertained the nature of this my
invention, and in what manner the same is to be performed, I declare that what
I claim is
1. In a photographic dark slide the combination with the frame having the
recessed part 2, and sliding shutter 11, of the carrier 4, hinged at 5, substantially as
described and shown upon the drawings, in Figs. 3 & 4.
2. In a photographic dark slide the modified combination with the frame having

page_text: the recessed part 2, and sliding shutter 11, and the retaining projection 9, of the
hinged retaining piece 10, substantially as described and illustrated in Figs. 5,
7, 8 & 10.
3. In a photographic dark slide, the combination therewith of the method herein-
before described and illustrated of securing the cloth pieces 12 & 14, that is to say,
leaving the ends from 15 to 16 (see Fig. 7) loose, and also the nipping in of the
slide at 17, to the end of the frame, substantially as set forth, and for the purposes
specified.
Dated this 14th day of October 1891.
CHARLES T. POWELL,
12, Cherry Street, Birmingham, Applicant's Agent.