Improvements in Photographic Cameras.
Year: 1889

page_text: Date of Application, 14th May, 1889
Complete Specification Left, 14th Feb., 1890-Accepted, 15th Mar., 1890
PROVISIONAL
SPROLRICATION
Improvements in Photographic Cameras.
We, JOHN HENRY SKINNER, and EDWIN JACKSON LYTH trading as J. H. Skinner
and Co. of East Dereham, in the County of Norfolk, Photographic Apparatus Manu-
facturers, do hereby declare the nature of this invention to be as follows:-
The object of this invention is to provide photographic cameras with means whereby
they can be quickly extended or closed as desired.
The extension apparatus of photographic cameras at present in use consists of a
pinion gearing into a rack, the said pinion being actuated by a milled headed screw.
According to this invention I dispense with the pinion and provide a cog wheel of
suitable size gearing into the rack on the frame. This cog wheel is provided with a
handle or turn for actuating the same.
CASTLE SMITH,
Per F. W. Golby,
"Invention" Office, 54, Fleet Street, London, E.C., Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Photographic Cameras.
We, JOHN HENRY SKINNER, and EDWIN JACKSON LYTH, trading as J. H. Skinner
& Co. of East Dereham, in the County of Norfolk, Photographic Apparatus Manu-
facturers, 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 :-
The object of this invention is to provide photographic cameras with means whereby
they can be quickly extended or closed as desired.
The extension apparatus of photographic cameras at present in use consists of a
pinion gearing into a rack the said pinion being actuated by a milled headed screw.
According to this invention we dispense with the pinion and provide a cog wheel of
suitable size gearing into the rack on the frame. This cog wheel is provided with a
handle or turn for actuating the same.
In the accompanying drawings, Figure 1 shews a side elevation of a photographic
camera partially extended; Figure 2 shews it closed; and Figure 3 is an enlarged
view of the details of our invention.
A transverse axle A is supported so as to rotate in fixed bearings B on the side of
the camera frame. On each end of the said axle is rigidly keyed a toothed wheel C
to gear with the racks D on the base plate of the camera frame. One or both of the
toothed wheels C is provided with a folding handle E which is hinged so as to fold
down flat or close to the face of the wheel, so as to be out of the way when not in use.
A bolt F is also provided to lock the toothed wheel when the correct focus is
obtained. This bolt F is toothed at its lower end to fit the teeth of the wheel C and
is provided with a slot G which works over pins or screws H fixed to the plate J, and
is actuated by means of the button or thumb catch K.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is:
The means for rapidly extending or closing photographic cameras consisting of
toothed wheels keyed to the axle A rotating in bearings B on the side of the camera

page_text: frame, the said toothed wheels C gearing with fixed racks D on the camera base and
provided with locking bolts F substantially as and for the purpose hereinbefore set
forth and illustrated in the accompanying drawings.
Dated this 14th day of February 1890.
CASTLE SMITH,
Per F. W. Golby,
"Invention." Office, 54, Fleet. Street, London, E.C., Agent for the Applicants.