Improvements in Photographic Cameras.
Year: 1889

page_text: Date of Application, 2nd May, 1889
Complete Specification Left, 1st Feb., 1890-Accepted, 19th Apr., 1890
PROVISIONAL SPECIFICATION.
Improvements in Photographic Cameras.
I RICHARD WILLIAMS THOMAS of 121 Cheapside in the City of London, Artist, do
hereby declare the nature of this invention to be as follows
-
2
My invention is principally designed for Cameras for taking instantaneous
photographs
I construct my improved Camera with two lenses and preferably in the shape of an
ordinary field or opera glass-one side being fitted with a lens and focussing glass and
the other side being provided with a lens and also suitable arrangements for the dark
slide and shutter-the two sides are joined together and worked backwards and for-
wards by means of a screw as in an ordinary field glass and the lenses in each side are
so arranged that by movement of the screw both are focussed at the same time-the
shutter is connected with a catch or sping fixed or projecting to or near the wheel or,
thumbscrew by which the screw is worked
- To bring my invention into use the operator places in the side of the Camera
arranged for the purpose a dark slide containing the plate which he arranges ready
for use he then looks on the focussing glass in the other side of the Camera and
regulates the screw until he secures the required representation on the focussing glass
and then releases or touches the catch or spring connected with the shutter which,
causes the shutter to open and close
By means of my invention the operator is able to see the object at the time he
takes the photograph and the risk of failure is thereby minimised
Dated this 2nd day of May 1889
WHITE & DE BURIATTE,
--38, Holborn Viaduct, E.C., Agents for the Applicant.
COMPLETE SPECIFICATION
Improvements in Photographic Cameras.
I RICHARD WILLIAMS THOMAS of 121 Cheapside in the City of London 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:
My invention is principally designed to provide a hand or detective Camera for
taking instantaneous photographs although it may if desired be fixed to a stand and
used in the ordinary way.
In carrying out my invention I form a camera with two lenses and preferably after
the manner of an ordinary field or opera glass; one side being fitted with a lens
shutter and dark slide and the other with a lens and ground glass focussing screen.
The tubes in which are mounted the two lenses are connected by means of a rod
carrying pinions to engage in racks mounted on the tubes and controlled by a wheel
or screw or other device so that the two lenses may be focussed at the same time.
Referring to the accompanying drawing and to the letters of reference marked
thereon
A is the body of the camera divided in the middle or other suitable point by a plate
or partition B Over one part of the camera I fix a flanged tube in which slides
another tube D which is provided at its side with a rack E. This tube D carries the
lens F and is screwed internally, into this screwed portion I screw an instantaneous
shutter of any ordinary and well known type.

page_text: Over the other division of the camera is also fixed a flanged tube G in which slides
a tube H which is provided with a rack I said tube also carries the focussing
lens.
A rod J working in bosses K K₁ fixed to the sides of the tubes C G carries two
small pinions L L-shown in dotted lines-this rod J is also provided with a nut or
wheel M by means of which the rod J is turned so regulating the lenses and by means
of which the two lenses of the camera are simultaneously focussed.
To use my improved camera the operator after setting the instantaneous shutter then
withdraws the shutter of the dark slide holds the camera up in a convenient position
or fixes it on a stand then whilst looking on the screen focusses the object which he
wishes to photograph, when the said object is in proper focus the shutter may be
immediately released without the relative position of the operator and camera being-
altered, the exposure is then made and the shutter of the dark slide closed.
In the drawing the instantaneous shutter N is shown on the end of the Camera'
opposite to the nut or wheel M on the rod J but I may find it advantageous to place
the shutter near to the nut or wheel M so that focussing and releasing the shutter may
be effected by the same hand of the operator. It will be seen that the object is clearly
in view at the time the exposure is made thus reducing the risk of failure to a
minimum.
my
Having now particularly described and ascertained the nature of
said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:
The general arrangement and combination of parts in my improved photographic
camera substantially as herein described and as illustrated by the accompanying
drawing.
POPPLEWELL & Co.,
Agents for the Applicant.