Improvements in and relating to Photographie Cameras.
Year: 1899

page_text: Date of Application, 18th July, 1899
Complete Specification left 18th May. 1900-Accepted, 18th July, 1900
Date of Application, 18th July, 1899
Complete Specification Left 18th May. 1900-Accepted, 18th July, 1900
Improvements in and relating to Photographie Cameras.
SAMUEL DUNSEITH MCKELLEN, 4, Mill Street, Long Millgate, Manchester,
Photographic Apparatus Manufacturer, do hereby declare the nature of this inven-
tion to be as follows:
-
Hand cameras of the box form are frequently made with a ground glass on the
top the full size of the desired picture. A mirror is hinged bisecting the angle
formed by the planes of the ground glass and the sensitive plate. This mirror
intercepts the image from the lens and reflects it on the ground glass. In cameras
of this kind and working with only one lens the mirror at the moment of exposure
is caused to remove from its oblique position and is raised up towards the ground
glass past the back of the lens so that it shall cease to intercept the image which
is then free to pass from the lens to the sensitive surface. My invention has
special reference to magazine hand cameras in which the sensitive plate after
exposure is removed by mechanical means and has for its object the utilization
of the movement of the mirror above named to actuate or assist the mechanism
so employed.
Improvements in and relating to mo
SAMUEL DUNSEITH MCKELLEN, of 4, Mill Street, Long Millgate, Manchester,
Photographic Apparatus Manufacturer, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:―
Hand cameras of the box form are frequently made with a ground glass on the
top the full size of the desired plate. A mirror is hinged bisecting the angle
formed by the planes of the ground glass and the sensitive plate. This mirror
intercepts the the image from the lens and reflects it on the ground glass. In
cameras of this kind working with only one lens the mirror at the moment of
exposure is caused to remove from its oblique position and is raised up towards
the ground glass past the back of the lens so that it shall cease to intercept the
image which is then free to pass to the sensitive plate. When this has been done
suitable means are used to replace the mirror in the oblique position so as to
again intercept and reflect the image to the ground glass. My invention has.
special reference to magazine hand cameras in which the sensitive plates after
exposure are removed by mechanical means and has for its object the utilization.

page_text: of the upwards or downwards movement of the mirror above named to actuate or
assist the mechanism so employed. There are many systems of plate changing
in use in magazine hand cameras to which this invention may be applied. It is
not necessary to describe more than one which is one of the changing systems
adopted by me in my magazine hand cameras.. I make my sheaths carrying the
glass plates or films, with projecting pins. The ends of these run in grooves the
front sheath rests against a rail at top and its pins which are at the bottom rest
against a barrier. In this position the first plate is in correct register.
The
other sheaths stand behind the front one and the whole lot are pressed forwards
by a back spring. A pair of pushers of any convenient form are at one end hinged
to the mirror. When the mirror is up at its highest after exposure the lower
ends of the pushers are over the front sheath pins. When the mirror is being
set it pushes these pushers downwards. They press down on the sheath pins
carrying the sheath away from its resting place on the top rail and its pins off the
barrier. The sheath is thus released and falls into the bottom of the camera the
next sheath taking its place at front. When the next exposure is made the
mirror in rising draws the pushers after it so that they assume the position over
the front pins as before ready to push them down when the mirror is being set.
I do not confine myself to this method of using my invention as it is capable of
application to almost every system of magazine changing in hand cameras. And in
order that my invention may be more readily understood and readily carried into
effect I have annexed hereto a sheet of drawings Fig. 1 being a vertical section
Fig. 2 a cross section on the line A, B, and Fig. 3 a similar view to Fig. 1 of so
much of a camera of the foregoing description as is necessary to illustrate my
invention and in which a represents a box b the lens cc the sheaths which contain
the sensitive plates or films and which are held in position by the spring & pressing
them against the rail e-f is the hinged mirror and g the ground glass onto which
the desired view or picture is to be reflected by the mirror. h represents the slots
which are formed by the plates & into which the pins cl of the sheat care
placed. Fig. 4 shows a front view and Fig. 5 an edge view of a sheath in which
e are the projecting pins and Fig. 6 shows more clearly the sheath pins in the
slots and the pusher hooks in their upper position. To the underside of the
mirror f I hinge at f¹ the two pushers J, J¹ each having a hook K, these hooks
are arranged so as to be exactly over the pins c¹ of the front sheath so that by
pulling the cord the mirror to deçend carrying the pushers with it into the posi-
tion shown in Fig. 3 and the hooks K engaging with the pins c¹ of the front sheath
forces the sheath downwards and out of the grip of the spring d. The sheath is
then at liberty to fall to the bottom of the camera and its place is taken by the
second sheath. The exposure may now be made by liberating the mirror when
it assumes the position shown in Fig. 1 thus bringing the hooks of the pushers
over the pins of the second sheath and so on until all the 'sheaths have passed.
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:
In a magazine reflecting hand camera the utilization of the movements of the
reflecting mirror to assist or actuate the changing mechanism.
Dated this 17th day of May 1900.