Improved Plate Holder or Dark Slide for Photographic Purposes.
Year: 1892

page_text: Date of Application, 3rd May, 1892
Complete Specification Left, 3rd Feb., 1893-Accepted, 4th Mar., 1893
PROVISIONAL SPECIFICATION.
Improved Plate Holder or Dark Slide for Photographic Purposes.
I THOMAS SCOTT, of Victoria Crescent, Eccles in the County of Lancaster,
Builder, do hereby declare the nature of this invention to be as follows:-
My said invention relates to an improved construction of plate holder or dark
slide for holding plates or other sensitive media and exposing them in a camera.
According to my said invention the "rabbet." or equivalent projecting part of
the holder opposite to the shutter and against which the plate bears when in
register is formed on.or attached to a hinged or flexible flap in such a manner that
when the shutter is withdrawn the said flap may be raised and the plate may be
removed. When however the sliding shutter is closed the shutter presses down the
said flap and retains the plate securely in position. When the plate holder is in
the camera and the shutter is withdrawn the said flap will bear against part of the
body of the camera and being securely held thereby the plate will be retained in
register and prevented from falling into the camera. A groove is provided for
receiving the shutter and more securely holding the flap down while excluding
light. For the latter purpose the joints of the flap with the sides of the plate
holder are also made angular or bent. A corresponding hinged flap may be
formed immediately under the shutter at the end where the shutter is inserted or
withdrawn in such a manner as to simultaneously act as a "rabbet" for retaining
the plate and as an automatic "cut off" to exclude light when the shutter is
entirely withdrawn.
My said invention is applicable to both single and double plate holders. For
the latter the flaps are arranged in pairs on opposite faces of the plate holder.
One or more springs may be provided for causing the flaps to be continually
pressed upwards and I preferably make the edge of the "rabbet" which receives
the end of the shutter with a bevelled or curved edge on to which the end of the
shutter may easily slide.
The usual springs are provided for pressing the plate upwards against the
bearing surfaces to ensure perfect register as will be well understood.
Dated this Second day of May 1892.
EDWARD TURNER WHITELOW,
70, Deansgate, Manchester, Agent for the Applicant.
COMPLETE SPECIFICATION.
Improved Plate Holder or Dark Slide for Photographic Purposes.
I THOMAS SCOTT of Victoria Crescent Eccles in the County of Lancaster,
Builder, 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 and accompanying drawings:
My said invention relates to an improved construction of plate holder or dark
slide for holding plates or other sensitive media and exposing them in a camera.
According to my said invention the "rabbet "b or equivalent projecting part of
the holder opposite to the shutter and against which the plate e bears when in
register is formed on or attached to a hinged or flexible flap in such a manner
that when the shutter is withdrawn the said flap may be raised and the plate may
be removed. When however the sliding shutter is closed as shown in section in
Fig. 1 and in plan in Fig 2. the shutter presses down the said flap and retains the

page_text: plate securely in position. When the plate holder is in the camera and the shutter
is withdrawn the said flap b will bear against part of the body of the camera
and being securely held thereby the plate will be retained in register and prevented
from falling into the camera. A groove is provided in the flap 6 for receiving the
shutter and more securely holding the flap down while excluding light. For the
latter purpose the joints of the flap with the sides c of the plate holder are also
made angular or bent as shown in Fig. 2. A corresponding hinged flap may be
formed immediately under the shutter at the end where the shutter is inserted or
withdrawn in such a manner as to simultaneously act as a "rabbet" for retaining
the plate and as an automatic "cut off" to exclude light when the shutter is
entirely withdrawn.
My said invention is applicable to both single and double plate holders. For
the latter the flaps are arranged in pairs on opposite faces of the plate holder as
shown at a in Fig. 3. In this case a screen or partitions is interposed between
the two plates.
One or more springs may be provided for causing the flaps to be continually
pressed upwards and I preferably make the edge of the "rabbet " which receives
the end of the shutter with a bevelled or curved edge as shown in the drawings on
to which the end of the shutter may easily slide.
The usual springs such as h are provided for pressing the plate upwards against
the bearing surfaces to ensure perfect register as will be well understood.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is―
In a photographic plate holder a hinged flap secured by the shutter when closed
substantially as and for the purpose herein before described and as illustrated in
the accompanying drawings.
Dated this 2nd day of Fun 1002
EDWARD TURNER WHITELOW,
70, Deansgate, Manchester, Agent for the Applicant.