IMPROVEMENTS IN PHOTOGRAPHIC CAMERAS
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, JAMES THOMSON of 21 High Park Street, Liverpool, in the county of
Lancaster, Photographic Artist do hereby declare the nature of my invention
for IMPROVEMENTS IN PHOTOGRAPHIC CAMERAS to be as follows :-
My Invention consists in the combining of one whole camera and a portion of
another larger camera so as to be when combined equally available for use; and
when not in use the smaller camera will fold up within the larger portion of the
larger camera, and the combined cameras will then be of less size and weight than
the larger cameras of similar size as made at present, and the larger camera at one-
third of its usual cost.
.
I carry out the combination in the following way. A frame for the back
portion of the larger combined camera for holding the prepared plate is made
similar to the back frame of the smaller camera only a little larger, say the smaller
to be 12 inches by 10-inches plate, and the larger a 15 inches by 12 inches plate,
then the depth of the smaller camera when packed up will be 3 inches, and the
larger, when both are packed up, 5 inches. When being used all the expensive
parts of the smaller camera will answer for the larger one, nothing further being
required in the larger one but the frame and dark slide for holding the prepared
plate and the focussing glass or screen.

page_text: .COMPLETE SPECIFICATION.
I JAMES THOMSON of 21 High Park Street Liverpool in the County of
Lancaster, do hereby declare the nature of the said invention for IMPROVEMENTS
IN PHOTOGRAPHIC CAMERAS" and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement :-
My invention consists in combining one whole camera with a portion of another 5
larger camera so that when combined each shall be equally available for use, and
the smaller camera will fold up within the portion of the larger camera when not
in use.
The combined cameras will then be of less size and weight than an
ordinary camera of the larger size alone and the larger camera will be obtained
at one third its usual cost.
A frame forming the back
plate is made similar to the
smaller will carry a plate
The depth of the smaller
1
I carry out the combination in the following way.
portion of the larger camera for holding the prepared
back frame of the smaller camera only larger, say the
12 inch by 10 and the larger a plate 15 inch by 12.
camera when packed up will be 3 inches, and tho two together when packed up 1
5 inches.
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DESCRIPTION OF THE DRAWINGS.
Fig 1 is a longitudinal vertical section closed, and fig 2 a similar section open of
my improved combined camera, a base board b bellows, c lense aperture, & front
carrier and adjusting appliances, e extending appliances. These parts are all of
usual or any suitable construction f back frame attached to bellows, and constructed
to fit within the larger back frame, g. The frames f. g. are made with grooves h. i.
for the focussing glass and dark slides and either one or the other is attached to
the base board a by the screws ; according as a smaller or larger picture is
required. As shown the Camera is arranged for large plates and when it is
desired to use smaller plates the frame g is removed and the frame f secured to
the base board. As shown by the drawings the whole apparatus folds up into
compact form and is available for both large and small views. When required
for small views only the frame g may be dispensed with and the smaller portion
only carried from place to place.
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
First. The combination of a photographic camera with a camera back frame
substantially as herein setforth.
Second. The combination with the back frame 9 of the back frame ƒ and
accessories substantially as herein setforth.
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