Improvements in and relating to Photographic Camera Dark Slides.
Year: 1890

page_text: Date of Application, 20th Dec., 1890
Complete Specification Left, 21st Sept., 1891-Accepted, 24th Oct., 1891
PROVISIONAL SPECIFICATION.
Improvements in and relating to Photographic Camera Dark Slides.
JOSEPH PITT 12 Belchers Lane, Bordesler Green near Birmingham, Modeller,
and WILLIAM HUDSON 118 Gooch Street Birmingham Photographer do hereby
declare the nature of this invention to be as follows:-
Our invention consists of a shallow box with flange running round its outer edge,
and can be made in wood, metal, or paper mache, metal preferred. In this box we
solder or secure a rim, allowing a margin round it, so as to allow lid (hereafter
mentioned) to fall into. This rim is to hold sensitive plate. The lid is now
arranged so as to fall into box and over rim and sensitive plate. The lid being
hinged on one side of box by means of wire passing through box from side to side.
The lid working freely on its hinge, hinge also forming lever outside box, enabling
And so expose
operator to raise lid when dark slide is in position in camera.
sensitive plate, and dispensing with cap on lens, to enable operator to make
instantaneous exposures, we fix elastic springs to lever and dark slide. The lid is
kept closed by a catch which can be released at will of operator. Thus forming an
instantaneous shutter and dark slide combined, and can be attached to any
.camera.
Dated this 10th day of December 1890
JOSEPH PITT.
WILLIAM HUDSON.
COMPLETE SPECIFICATION.
Improvements in and relating to Photographic Camera Dark:Slides.
We JOSEPH PITT of 118 Gooch Street in the City of Birmingham, Modeller
and Designer, and WILLIAM HUDSON, also of 118 Gooch Street, Birmingham,
aforesaid Photographic Artist 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 attachments for photographic hand and other cameras,
consisting essentially of combined dark slides, with shutters for exposure means, in
connection with the said slides.
According to our invention, the front, or both front and back of the shutter,
(according to the number of plates to be carried) is or are provided with swinging
or hinged doors or flaps, which are opened out, or closed by means connected with
them and the outside of the camera.
Figure 1 of the accompanying drawings, represents in longitudinal vertical
section, a photographic hand camera, provided with improvements made according
to our invention.
The said improvements consist essentially in combining with a dark slide, a
shutter or shutters, or light exposure means, or the said shutter in connection with
the dark slide, may be employed without the employment of instantaneous shutters
approximate to the lens.
The flaps, which constitute the shutters of the dark slide, are mounted and
hinged to the two opposite sides of the same, and are provided with means in the form
of cranked or other arms, whereby the said flaps and shutters are opened and
closed from the outside of the camera.
The said dark slide, as shown, is adapted to carry two sensitized plates, and is

page_text: therefore provided with two hinged flaps or closures for the covering up of them,
when exposure is not required.
In connection with the said dark slide and shutter, we employ a time or other
shutter in front of the lens aperture, although the flap or shutters of the dark slide,
may be worked if necessary, for instantaneous or time exposure.
Figure 2 represents the front side of the camera, and
Figure 3 shows the combined dark slide and shutter separate, and removed from
the
groove made for its reception at the back of the cainera.
Figure 4 is a topside plan of the back end of the box of the said camera, whilst
Figure 5 is a horizontal section of the said end, showing the flaps of the shutters or
exposure means, in the position which they take, when open, as represented in the
dotted lines.
a is the camera body, consisting essentially of a rectangular shaped box, having
an open back part, and a semi-closed front part, of which the former is closed by
a combined dark slide and shutter or shutters, fitting within a groove or
channel a², recessed within the inside back of the said box body part, while the
front is fitted with a lens c, mounted before a lens aperture a³, having a sliding
shutter d, working before it.
The combined attachment b, consists of an open frame, with a partition b³,
directed down its middle, and upon the opposite sides of which, carriers 63, 64, for
the reception of the sensitized plates, are fitted.
The two sides of the frame, have mounted within their boundary edges, horizon-
tally opening and hinged flaps e, e³, which when closed, fit light-tight within the
said boundary edgings, but when opened, allow the plates resting within the
carriers, to be exposed.
Each flap or shutter, is opened and closed by cranked arms f, f, with the stems
of them, connected to the hinges or joints e-e³, of the flaps or shutters e; e, and
which hinged-sides of the said shitters, are mounted upon the two opposite sides of
the dark-slide-frame, and open in the direction as indicated by the arrows, so that
on the trans-position of the combined attachment, the flaps or shutters open in one
direction.
It may be observed that the stems of the cranked-arms-f,-pass-outwardly through
the top, of the dark slide framing, so that the cranked ends of them, when the
flaps.are-closed,-take-respectively under spring clips,, but when open, take
under a yielding clip, as represented by dotted lines.
As before stated, the flaps or shutters, may be arranged to open-out-and close-for
instantaneous and time exposure, as well as for ordinary exposure.
The supplementary shutter, d, for instantaneous and time exposure, has an
exposure aperture or hole d², and is traversed within guides ³, in one direction, by
an elastic cord i, connected to the camera at one part, and to a stud, of the
shutter d, of the other part, and is traversed in the other direction, either by a
cord j, or by raising by hand.
Figure 6 represents a photographic hand camera, with a modified form of attach-
ment, as previously described and set forth.
Figure 7 is a front elevation of the same.
In this arrangement, the flap or shutter is hung, or swings vertically from the
top side of the dark slide frame, which in this instance, is arranged to carry only
a single sensitized plate.
a, is the camera body part, is the dark slide attachment, e is a flap or shutter,
jointed at el, and adapted to take the position as represented in dotted lines, by the
pressing down of the arm, whose inner end is connected with the joint part of
the said flap or shutter, and whose return movement is performed by a spring f
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:
First In a photographic hand, or other camera, combining with a dark slide,

page_text: of a hinged flap or shutter, or hinged flaps or shutters, arranged to be worked
horizontally or vertically, substantially as and for the purpose, described and set
forth in the several figures of the drawings.
Secondly-In photographic hand or other cameras, working the flaps or shutters,
of combined dark slides and hinged flaps or shutters, by means of arms or levers,
connected to the jointed sides of them, and directed outwardly through the tops of
the combined attachments, substantially as set forth.
Thirdly The general construction and arrangement of the parts of cameras,
with dark slides or combined attachments, and the means of holding the flaps or
shutters in predetermined positions, substantially as described and set forth.
Dated this 19th day of September 1891.
JOSEPH PITT.
WILLIAM HUDSON.
By Henry Skerrett,
6, Livery Street, Birmingham, Agent for Applicants.