Year: 1888

page_text: I JOHN PLACE, of Bull Street, Birmingham, in the county of Warwick,
Optician 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 :-
This invention relates to improvements in rapid or instantaneous shutters for
photographic purposes, and its object is to provide a simple and effective double
slide shutter, which can be operated more or less rapidly by hand, or may he operated
pnuematically, and more particularly applicable to stereoscopic work, but which may
be used also singly if desired.
The accompanying illustrative sheet of drawings shew this my invention, in which
Fig. 1 represents the shutter and pnuematic arrangement in elevation.
Fig. 2 is a plan view of Fig. 1.
Fig. is a horizontal section of Fig. 1 upon line A—B.
Fig. 4 is a cross section of Fig. 1, upon line C-D.
Fig. 5 is a cross section of Fig. 1, upon line E-F.
Fig. 6 shews a detached view in elevation, of the sliding shutters &c.
Fig. 7 is a plan of Fig. 6.
Fig. 8 is a sectional view through pnuematic box.
Fig. 9 shows pnuematic arrangement operating by means of a crank motion.
a, is a frame having two apertures b, b, the front part of which at c (Fig. 3)
accommodates the front of the lens or lenses. d, d, are grooves to receive the
sliding shutters e, e¹. fis a roller or pulley mounted or carried upon the end of the
frame, and over which the cord passes by which the sliding shutters are operated;
the sliding shutter e being connected to the cord upon the one side of the pulley,.and
the shutter e¹ being connected to the cord upon the opposite side of the pulley, so that
in pulling either of the said cords, motion is given to the two shutters in opposite
directions, passing opposite to each other at midway of their travel. Thus the exposure
to each lense would be equal in duration.
It can be readily seen that a very rapid simultaneous motion can be imparted
to the slides, by the pulling of the cords.

page_text: is
g a pnuematic box having through its centre a spindle, which extends outwards
upon it one side, and upon such extension is mounted a cord pulley h. To the
periphery of this cord pulley is attached the two ends of the cords i, j, in such a
manner that when the pulley revolves, in one direction it winds upon its said periphery
the cord i, while at the same time it would unwind the cord j, and vice versa, and so
give motion to the sliding shutters.
At the sides of the pnuematic box I provide two tubes k, 1; the tube k serving as
a cylinder in which a piston m works freely. To this piston a cord is attached which
thence passes over and around the spindle n, the end being secured thereto; the other
tube serving to receive an india rubber or other blow pipe.
Upon a puff of wind passing up the tube l, it will be readily understood that the
piston m would be driven forward, pulling with it its cord, and thereby rotating the
spindle n and pulley h, which latter would in its turn operate the shutters as before
described.
In Fig. 9 is illustrated how this my pnuematic arrangement may operate upon a
is the crank
sliding shutter by means of a crank pin and connecting rod, in which o,
pin and p the connecting rod.
From this it will be seen that the travel of the piston m can be such as to impart
one revolution to the pulley h, and thereby first open or expose the aperture b², and
then close it, similarly as before described.
I have shewn these two methods of applying this my puuematic arrangement, but
it will be clear that in various modified forms in detail, the circular motion of the
pulley may be made to impart the necessary sliding motion to the shutter or
shutters.
It will also be apparent that although this pnuematic arrangement is illustrated as
applied to a stereoscopic or double lens, it would serve equally well with a
single lens.
Also one or both of the lens openings in the shutter frame a, may be used as
desired.
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
1st. The combination and arrangement of the parts constituting the double sliding
shutter to be operated by hand, substantially as described and illustrated, and for the
purposes specified.
2nd. The combination with the parts constituting the double or single sliding
shutter, of the pnuematic arrangement, substantially as described and illustrated and
for the purposes set forth, in Figs. 1, 2 & 3.
3rd. The pnuematic arrangement constructed and acting similarly as described and
illustrated, and operating either by cords, or crank pin and connecting rod, or other
method of connection with the shutter or shutters and for the purposes set forth.
Dated this 2nd day of March 1888.
CHARLES T. POWELL,
12, Cherry Street, Birmingham,
Applicant's Agent.