Improvements in and relating to Means for Carrying and Exposing in the Camera Photographic Dry Plates or Films.
Year: 1899

page_text: Improvements in and relating to Means for Carrying and Exposing in
the Camera Photographic Dry Plates or Films.
We, FREDERICK MACKENZIE, Optician, and GEORGE WISHART, Camera Maker,'
both of 17, Douglas Street, in the County of the City of Glasgow, do hereby
declare the nature of our invention to be as follows:-
This invention has reference to and comprises improvements in and relating
to means for carrying and exposing in the camera photographic dry plates or
films in a convenient manner and without danger of exposure to the ordinary
day light.
in carrying the practice our improvements we use an actinic light proof
envelope and a special dark cell or slide for exposing the plate or film in the
camera, constructed as follows:-
The light proof envelope is made in two parts, one the inner part, composed
of a piece of stiff actinic light proof cloth or strong paper, or other suitable
material, of the size of the plate to be used, having its sides and one end turned
over so as to form grooves into which the plate is stipped.
To the end having the groove a covering flap of light proof cloth or paper
is secured which folds over the face of the dry plate placed in the grooves. A
small bar of wood or other material is secured on the end of this covering flap
outside. The other or outer part of the envelope consists of a carrier also formed
of actinic light proof cloth or other material having turned over edges at the
sides and one end to form grooves, which may be strengthened by an insertion
of bent metal strips. A small portion is cut away at the ungrooved end to
receive a small bar to act as a stop secured on the end of the inner part which
is slipped within the outer part. The plate is placed, while in the dark room,
within the grooves of the inner part and covered by the flap, the whole being
inserted within the grooves of the outer part, the uncovered end of the plate
entering the groove at the end so that all light is completely excluded from
the plate.
The dark cell or slide for exposing the plate in the camera is made of book
form one side being fitted with the usual sliding door. The plate and its
envelope are laid within the cell on the sliding door which has a groove near
its end to engage with the bar on the covering flap of envelope. The other
side of the cell is fitted with springs to hold the plate in position and may be
fitted with a celluloid or glass peep hole by which any number or other mark
on the plate envelope may be read. When the cell is placed in the camera
and the door drawn its groove engaging with the bar on envelope flap draws
it and the flap off the face of the plate and rolls it up within the cell and on
the closing of the door recovers the plate. The plate and its envelope can then
be taken out of the cell and placed in the pocket or otherwise disposed of.
Prepared in this way any number of plates can be carried by the operator

page_text: while only one cell is required. Instead of employing a separate cell it may be
built to the end of the camera and form an integral part of same.
Dated the 12th day of April 1899.
W. RM. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
Improvements in and relating to Means for Carrying and Exposing in
the Camera Photographic Dry Plates or Films.
We, Frederick MacKenzie, Optician, and GEORGE WISHART, Camera Maker,
both of 17, Douglas Street, in the County of the City of Glasgow, do hereby
declare the nature of our invention and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement in writing, reference being made to the accompanying drawings:--
This invention has reference to and comprises improvements in and relating
to means for carrying and exposing in the camera photographic dry plates or
films in a convenient manner and without danger of exposure to the ordinary
day light.
And in order that our said invention may be properly understood we have
hereunto appended two sheets of explanatory drawings in which Figure 1 is
a plan and Figure 2a section of the actinic light proof envelope. Figure 3
is a plan of one part of said envelope with the covering flap broken away and
Figure 4 is a section of the same, while Figure 5 is a plan of the other part.
Figure 6 is a plan of a dark cell or slide for exposing the plate in the camera,
opened up, and Figure 7 is a section of same, closed and with the exposing door
drawn open, also showing in dotted lines the door closed.
Figures 8 and 9 are respectively a plan and a section of a dark cell or slide
for exposing the plate in the camera fitted with a flexible or Venetian sliding
::
door and fitted for use in combination with the light proof envelope.
In carrying into practice our improvements we use an actinic light proof
envelope and a special dark cell or slide for exposing the plate or film in the
camera.
Referring to the drawings:-
The light proof envelope Figures 1 and 2 is made in two parts, one the inner
part, shown in Figures 3 and 4 composed of a piece of stiff actinic light proof
cloth or strong paper, metal or other suitable material of the size of the plate. 6
to be used, having its sides and one end d turned over so as to form grooves
into which the plate is slipped.
To the back of end d having the groove a flexible covering flap c of light proof
cloth or paper shewn broken away in Figure 3 and turned over in Figure 4
is secured, which folds over the face of the dry plate 6 placed in the grooves.
A small bar f also shown in Figure 2 of wood or other suitable material is
secured on the end of this covering flap e outside. The other or outer part of
the envelope shown in Figure 5 consists of a carrier also formed of actinic light
proof cloth or other material having turned over edges at the sides and one
end to form grooves, which may be strengthened by an insertion of bent metal
strips. A small portion at his cut away at the ungrooved end to receive a
small bar Figures 1, 2, 4, and 7, to act as a stop and secured on the end of
the inner part which is slipped within the outer part. The plate 6 is placed,
while in the dark room, within the grooves of the inner part and covered by
the flap c, the whole being inserted within the grooves g of the cuter part, the

page_text: uncovered end of the plate entering the groove at the end so that all light is
completely excluded from the plate, the bar i entering the recess h.
A flap of cloth or paper as indicated in Figures 1 and 2 may be secured to
the envelope a and be turned over its top end while a rubber band may be used
to keep it close while the envelope and plate is being carried in the pocket,
but this is not necessary.
The dark cell or slide Figures 6, and 7, for exposing the plate in the camera
is made of book form one side being fitted with the usual sliding door. The
plate and its envelope are laid within the cell on the sliding door which has
a groove near its end to engage with the bar f on the covering flap e of
envelope. The other side of the cell is fitted with a blade spring to hold the
plate in position and may be fitted with a celluloid or glass peep hole m by
which any number or other mark on the plate envelope may be read. The
end o of the blade spring is turned at an angle so that it engages with the
bar to prevent the envelope and plate being dislodged on the drawing out of
the door j
Angled metal strips are used to form the groove for the door and at
same time support the plate. When the cell is placed in the camera and th
door drawn its groove & engaging with the bar on envelope flap c draws
it and the flap off the face of the plate and rolls it up within the cell all as
shown in Figure 7 and on the closing of the door recovers the plate. The plate
and its envelope can then be taken out of the cell and placed in the pocket
or otherwise disposed of. Prepared in this way any number of plates can be
carried by the operator while only one cell is required. Instead of employing a
separate cell it may be built to the end of the camera and form an integral
part of same.
Figures 8 and 9 illustrate a dark cell or slide for exposing the plate enclosed
in a light tight envelope, in the camera fitted with a flexible or Venetian sliding
door, shown partially open, having a groove k in which the arrangements
otherwise are practically the same as in the cell described, two retaining blade
springs being shown in this case.
In Figure an arrangement is indicated by which it is possible to use our
light proof envelope with an ordinary open frame for inserting it in the camera
back. In this case a rigid plate el of celluloid or other suitable material as
shown in dotted lines is secured to the covering flap e by which it can be drawn
off to uncover the face of the sensitive plate and returned to recover it, in
which case the bar f is dispensed with.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:-
-
First. The means for carrying photographic sensitive dry plates or films and
exposing same in the camera consisting of an actinic light proof envelope and
an exposing dark slide constructed and arranged substantially as herein described
and illustrated by the accompanying drawings.
Second. The construction and use of actinic light proof envelopes for carrying
photographic sensitive dry plates or films and exposing same in the camera by
means of any suitable slides or dark cells substantially as herein described and
illustrated by Figures 1 to 5 of the accompanying drawings.
Third. The construction and use of dark slides for exposing in the camera
photographic sensitive dry plates or films contained in light proof envelopes
substantially as herein described and illustrated by Figures 6 and 7 of the
accompanying drawings.
Fourth. Dark cells or slides for exposing in the camera photographic sensi-
tive dry plates or films contained in actinic light proof envelopes fitted with
retaining springs and a grooved door substantially as herein described and
illustrated by Figures 6 to 9 of the accompanying drawings.

page_text: Fifth. An actinic light proof envelope for carrying and exposing in the
camera photographic sensitive dry plates or films consisting of a covering fitted
with the bars f and i and a receiving part formed with the grooves g, in com-
bination with an exposing dark cell fitted with a grooved sliding door j and
springs substantially as herein described and illustrated by the accompanying
drawings.