Improvements in Dark Slides or Plate Holders for Photographic Cameras.
Year: 1888

page_text: Date of Application, 10th May, 1888
Complete Specification Left, 11th Feb., 1889.
Complete Specification Accepted, 16th Mar., 1889
Improvements in Dark Slides or Plate Holders for Photographic
Cameras.
1, MICHAEL TAYLEURE of Market Place, Pocklington in the County of York,
Photographer do hereby declare the nature of this invention to be as follows:-
The invention relates to that part of a photographic camera known as the dark
slide or plate holder, which is used to contain and transport the sensitized plate. I
construct my slide in a special and peculiar manner so as to be perfectly light tight.
It may be single or double and the shutters may be specially constructed so as to
draw right out, a great advantage for landscape work on a windy day.
The invention is specially applicable for dry plate photography, and the slide may
be made of tin or other suitable material. The special construction of the slide is a
feature of the invention.
The mode of action is as follows:
Draw out the slides, which are curved at the top where the rings are, the latter
are provided for the purpose of keeping the india rubber in its place, as well as to
exclude the light from the plates when in use. When drawing out the slide facing
the lens, with one hand, place the other hand upon the other slide to keep it in its
place.
After drawing the slides out to charge the slide with fresh plates, place the sensi-
tized plates back to back with a piece of card the size of the plates between, as seen
in the sample sent, so as to keep the other plate secure from the light.
The slides will pack in a small compass, and no dark room or dark tent is
required.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool,
Patent Agents for the Applicant.

page_text: spring F. The shutters are now closed and the plates are kept in total darkness, and
can be carried from the dark room to the camera or put away until required.
When required for use, the holder is placed in position in the camera, the shutter
which faces the lens is opened, and one of the collodionised plates is exposed, the
other plate being, in the meantime, in total darkness. Even if the aforesaid shutter
is completely withdrawn, the light cannot penetrate into the compartment which
contains the unexposed plate, as the elastic joint roller C fills up the space occupied
by the shuttor.
When the exposure of the plate is completed, the aforesaid shutter is closed. By
reversing the holder in the camera, the sensitive surface of the other plate can now
be uncovered so as to receive the rays of light, the first named plate being, in the
meantime, kept in total darkness. The recess H is intended to facilitate the removal
of the plates or the partition E.
In some cases, it is desirable to substitute some other device, instead of the india
rubber joint rollers C. In hot climates, for example, the rubber would perish, and
for this reason, we sometimes employ a suitable curved plate or spring I, Figure 4,
covered with black velvet, and secured to the frame or kept in place by its own force
or by friction. The spring I exerts a pressure against the shutters and enables them
to be removed without lighting the films.
The appliances, herein set forth for excluding light when the shutters are with-
drawn, can be used with great advantage in combination with almost all kinds of dark
slides for photographic cameras, and they can easily be adapted to slides constructed
of wood or other material.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I declare that what I
claim is :-
1. A dark slide or plate holder in which the orifice of the slot, into which the
shutter or shutters are passed, is closed by elastic or springy material when the
shutter is not in position, but which yields to the pressure of the shutter when
the latter is pushed in and swells out filling the slot, and keeping the light
excluded as the shutter is withdrawn, whereby the shutter can, if it be desired, be
entirely withdrawn without permitting the entrance of light through its slot.
2. A dark slide or plate holder for photographic cameras in which a flat frame A
divided into separate compartments by the removable partition E and having guides
or channels B and an elastic roller C or spring I, is adapted to receive the sliding
shutters B B on each side of the partition aforesaid, whereby said shutters can be
completely drawn out when it is desired to uncover the sensitised surface of one of
the plates, without the risk of lighting the sensitised surface or film of the other
plate, substantially as described.
1
T1
1000
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool,
Patent Agents for the Applicant.