DARK SLIDE FOR PHOTOGRAPHIC CAMERAS
Year: 1884

page_text: I ARTHUR FULLERTON HOWMAN of George Street, Oxford in the county of
Oxford, Photographer do hereby declare the nature of my invention for "DARK
SLIDE FOR PHOTOGRAPHIC CAMERAS" to be as follows:-
=
My invention relates to a simple and inexpensive construction of slide for
photographic cameras, whereby I provide effectually against admission of light to
the sensitised plate within.
It consists of an outer rectangular frame with a back fixed thereto, the two sides
and bottom of the frame being made with grooves to receive the edges of a thin
metal slide which forms the front cover and the bottom having also an under
groove to receive one edge of the sensitised plate. The top of the frame has on its
inside a recess containing a rebatted strip pressed downwards by a spring and has
above that a groove holding a strip which is pressed forwards by a spring. There
is also a spring on the back which presses against the sensitised plate, keeping it
steady against shaking. When the plate is in the frame, it is held at its lower
edge in the groove at the bottom of the frame and at its top edge by the rebate of
the strip pressed downwards by a spring, and it is covered by the thin metal plate
which is slid in from the top and is held in the grooves of the two sides and
bottom. On withdrawing this slide, the sensitised plate is exposed in front, aud
light is prevented from entering by the top of the frame by the strip which is
pressed forward by a spring, closing the slit by which the metal plate is withdrawn.
Dated this 14th day of March 1884.
ABEL & IMRAY,
Agents for the Applicant,
28, Southampton Buildings,
London, W.C.

page_text: I ARTHUR FULLERTON HOWMAN of George Street Oxford in the County of
Oxford Photographer, do hereby declare the nature of my invention for "DARK
SLIDE FOR PHOTOGRAPHIC CAMERAS" and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement thereof :-
:-
My invention relates to a simple and inexpensive construction of slide for
photographic cameras, whereby I provide effectually against admission of light to
the sensitised plate within.
Fig. 1 of the accompanying drawings is a vertical section of a slide according to
my invention; Fig. 2 is a front view with the sliding shutter removed, and Fig. 3
is a sectional plan of the top part of the frame. A is the outer rectangular frame
having a fixed back B. The two sides and the bottom have a groove C to admit
the edges of a thin metal slide D which forms the front cover or shutter when it is
slid in behind the metal strip E that faces the top of the frame. On the back B
is fixed a spring F that presses against the sensitised glass plate G which is held
in position by its lower edge being engaged in a groove H and its upper edge
engaged within the recess of a rebated strip K that is pressed downwards by a
spring L. In the top of the frame there is a recess in which is fitted a strip M
pressed forwards by a spring N. On withdrawing the sliding shutter D against
which the strip M is pressed, this strip is pressed forward against E by the spring N
so as to cover the thin slit through which D is withdrawn preventing access of
light to the sensitised plate.
Having now particularly 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 :-
In a dark slide for photographic cameras, the combination of the frame A
grooved at H and its back B with spring F and the sliding shutter E with the
rebated strip K and its spring L and the strip M with its spring N, substantially
as and for the purposes herein set forth.
Dated this 20th day of Santambar 1881