IMPROVEMENTS IN PHOTOGRAPHIC SHUTTERS to be as follows:-
Year: 1885

page_text: I FREDERICK WOODWARD BRANSON of Leeds in the County of York,
Pharmaceutical Chemist do hereby declare the nature of said invention for
"IMPROVEMENTS IN PHOTOGRAPHIC SHUTTERS to be as follows:-
"
My improvements refer to that class of shutter which is described in the
Specification of a Patent granted to Richard Reynolds and myself dated April 2nd
1883 N° 1650, such shutter being also employed under the patent granted to me
dated 5th February 1884 N° 2767, such shutter being also employed in my
applications for Patents dated June 11th 1884 N° 8852, and December 22nd 1884
No 16793 and N° 16794, and the present Invention refers to the employment of a
second drop which fits so as to move freely in the same slide as the drop used in
the hereinbefore mentioned photographic shutter.
This second drop is placed in the slide below the original, and on its upper
portion a hinged or solid frame is provided, such frame forms the opening or
aperture through which the light passes for photographic purposes.
The aperture in the framework is covered in the first instance by the lower or
solid part of the second drop, and both drops are held by a catch; on the catch
being released the lower drop is instantaneously forced downwards by the upper
drop actuated through gravity, spring or other convenient means, the opening
therein passing quickly in front of the lense, followed by the upper drop which
shuts off the light by passing in front of the lense.
The slide is so arranged at the bottom part as to allow the second drop to fall
entirely out of it, its position being taken up by the first or upper drop. The second
drop is attached to the framework of the photographic shutter by an elastic cord
or its equivalent.
When preferred the upper and lower drops may be combined.

page_text: Improvements in Photographic Shutters.
I, FREDERICK WOODWARD BRANSON of Leeds in the County of York
Pharmaceutical Chemist 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 :-
My improvements refer to that class of shutter which is described in the
specification of a Patent granted to Richard Reynolds and myself dated April 2nd
1883 No 1650, such shutter being also employed under the patent granted to me
dated 5th February 1884 No 2707, such shutter being also employed in my
applications for Patents dated June 11th 1884 No 8852, and December 22nd 1884
No 16793 and 16794, and the present invention refers to the employment of a
second drop.
Fig. 1 is a front elevation. Fig. 2 a back elevation and Fig. 3 an end elevation
shewing my improvements as applied to photographic shutters. Fig. 4 is a side
elevation of parts employed for extending the upper part of the slide for the same.
Figs. 5 and 6 are front elevations shewing arrangement of drop.
a is the framework of the photographic shutter, b the flap, c the flap spindle
and d the adjustable balance weight, all of which have been fully described in the
specifications of the hereinbefore mentioned patents.
Hitherto I have employed only one drop e, my present invention refers to the
employment of a second drop f which fits so as to move freely in the slides g of
the photographic shutter.
This second drop f is placed in the slides g below the original drop e and on its
upper portion a hinged or solid frame h (as shewn at Fig. 6) is applied, such frame
forms the opening or aperture i through which the light passes for photographic
purposes.
When preferred the upper drop e and the lower drop f may be combined by
connecting them together at j, (Fig. 6) or attaching them together by means of the
cord (Fig. 5) When the cord is used the distances apart of the upper drop e
and the lower drop f may be adjusted by hanging such cord on any of the
hooks placed at different distances apart, thus reducing or increasing at pleasure
the time of exposure.
In order to extend the slides g on the framework a and to adapt the same to my
improvements, I employ the pieces m which are secured to the upper portion of
such slides by screws n as shewn at Figs. 1, 2, 3 and 4, these extension pieces m
can be readily removed when not required and secured in position as shewn in
dotted lines at m² Fig. 3.
The slides g are so arranged at the bottom part so as to allow the second drop f
to fall entirely out of it, its position being taken up by the first or upper drop e.
To the second drop f may be suspended by means of a rubber cord o a weight
hanging freely, such weight being varied in accordance with the amount of
acceleration required.
The aperture in the first instance is covered by the lower or solid part of the
second drop and both drops are held up by a catch p; on the catch p being

page_text: released the lower drop f instantaneously passes downwards followed immediately
by the upper drop e, these being accelerated through elastic cord o by the weight
suspended thereon, gravity, spring or other convenient means; the opening i
between them passing quickly in front of the lense is followed by the upper drop e
which shuts off the light by passing in front of the lense and remains there until
removed by the operator.
Having now particularly described the nature of my said invention and in
what manner the same is to be performed I declare that what I claim is
1st The application of drop f attached to or combined with drop e arranged and
working in combination therewith substantially as herein set forth and shewn in
the accompanying drawings.
2nd The arrangement and application of the pieces m and mode of applying the
same for extending the slide g on the framework a substantially as herein set
forth.
3rd The application of drops e and f in combination with the shutters described
in the specification granted to Richard Reynolds and myself dated April 2nd 1883
No 1650, also employed under the patents granted to me dated 5th February 1884
No 2767 also No 8852 dated June 11th 1884 and No 16793 and No 16794 dated
December 22nd 1884.