4000 Improvements in or connected with Photographic Cameras.
Year: 1897

page_text: Date of Application, 23rd Nov., 1897
A
4000
Improvements in or connected with Photographic Cameras.
I, ILIJA KARPOFF, of Rue Michailowskaja, Maison de l'Hotel d'Europe, No. 1-7,
St. Petersburg, in the Empire of Russia, Dealer in Photographic Apparatus, do
hereby declare the nature of this invention to be as follows:-
This invention has for its object to provide photographic cameras with means
whereby a number of sensitized plates can be rapidly brought into position for
exposure and he readily removed after exposure, the arrangement being such that
at each operation of a slide or the like a plate is brought into position for exposure
at the same time that one previously exposed is returned to the receptacle which
holds the plates before and after exposure. Each holder is utilized for two plates
and the piates at one side of each holder are first exposed in succession and there-
after the plates at the other side of each holder are exposed in succession the holders
being so manipulated that after one plate is exposed the holder and plates carried
thereby are reversed and returned to the top of the series in position for the
unexposed plate to be brought into position in its turn for exposure. The plates
are held in frames constituted by folding halves and having pins projecting from
their sides, say at each corner, the said pins at one side, or at both sides, being
preferably constituted by a wire which passes through eyes in the folding halves
The plate
of the frame to secure them together to hold the plate between them.
holders are charged by removing the said wire from one side and opening them
from the other side as on a hinge. Into each holder two sensitized plates are
placed each with its sensitized face outwards, a piece of black paper, or the like,
being placed between the said plates to prevent fight from passing through from
one plate to the other during exposure. When the plates and the intervening
light obstructor are in place the holder is closed and secured by the wire being
passed through the ears at the edge of each part. The inside of the camera and
the receptacle for the plates in their holders are provided with grooves in which
the pins projecting from the sides of the holders engage, the said grooves being
so formed as to cause the bottom frame and the plates carried thereby, when
withdrawn from beneath the series in the receptacle, to be turned into an upright
position for exposure, and in thus turning up to move the plate previously exposed
and the holler thereof, along the continuations of the grooves and force the last
named plate and its plate in its holder back onto the receptacle to the top of the
series of plates in their holders contained in the receptacle and so on successively
the plates to be exposed being drawn out with their holders from beneath the
series and after exposure being returned to the top of the series with the unex-
posed plate on the reverse side of the holder in position to be exposed when this
holder arrives at the bottom of the series.
The plates and their holders can be thus operated by means of bar normally
retained in position by a spring which is pressed to release the bar which is then
drawn forward, the inner ends of the said bar being provided with spring pieces
engaging behind the lowermost plate holder. By the forward movement of

page_text: this bar the lowermost plates in their holder are moved forward and the holder
thereof acts upon the lower edge of the holder of the plate previously brought into
position for exposure and moves it partly up the grooves both holders assuming
such a position that when the bar is pushed back again projections thereon turn
up into a vertical position the holder brought forward from the series for exposure,
the holder which carries the previously exposed plate being thereby pushed
to the top of the series of holders and plates with the exposed plate uppermost and
the unexposed plate in the same holder lowermost, and the plate to be exposed
is supported in an upright position in rear of the lense ready for receiving the
next picture. At each operation an indicator disc may be moved through a part
of a rotation so as to expose at an opening a figure shewing the number of plates
which have been exposed. Owing to the way in which the plates are manipulated
as aforesaid one plate carried in each holder of the series is exposed and after
these have all been exposed the second plates in each holder are similarly succes-
sively exposed so that pictures are eventually received on the two plates in each
holder when the exposed plates are all removed and fresh or unexposed plates are
put in their place, as hereinbefore described.
The arrangement and operation of the plates may be applied to any description
of camera whether binocular or not.
The plates and holders can be removed and replaced through an opening, pro-
vided with a cover, at the rear of the upper part of the camera and there may be
a removeable door at the back by which access to the edges of the plate holders
can be obtained.
There may be provided shutters moveable up and down by levers actuated by
toothed racks with which engage pinions on a shaft which can be operated by a
head from outside the camera. It can be operated by the same movement which
changes the plates by furnishing the bar by which the plates are changed with
a rack which engages a toothed wheel on the said shaft which is provided with
a spring which is wound up when the plate changing bar is withdrawn and the
aforesaid rack acts on the pinion. The shutter is retained in position by a spring
catch which can be released from the outside from its engagement which may be
with a notched disc on the said shaft.
Dated this 23rd day of November 190
JOHNSONS & WILLCOX.
47, Lincolns Inn Fields, London, W.C., Agents.
Improvements in or connected with Photographic Cameras.
I, ILIJA KARPOFF, of Rue Michailowskaja, Maison de l'Hotel d'Europe, No. 1-7,
St. Petersburg in the Empire of Russia, Dealer in Photographic Apparatus, 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 has for its object to provide photographic cameras with means
whereby a number of sensitized plates can be rapidly brought into position for
exposure and be readily removed after exposure, the arrangement being such that
at each operation of a slide or the like a plate is brought into position for exposure
at the same time that one previously exposed is returned to the receptacle which
holds the plates before and after exposure. Figure 1 of the accompanying draw-
ing is a plan with the top removed and Figures 2 and 3 are longitudinal sections

page_text: shewing two different positions of a camera constructed according to my invention.
Figures 4 and 5 shew a plate holder in the closed and the open position respectively.
Each holder C is utilized for two plates and the plates at one side of each holder
are first exposed in succession and thereafter the plates at the other side of each
holder are exposed in succession the holders being so manipulated that after one
plate is exposed the holder and plates carried thereby are reversed and returned
to the top of the series in position for the unexposed plate to be brought into
position in its turn for exposure. The plates are held in frames constituted by
folding halves and having pins projecting from their sides, say at each corner, the
said pins at one side, or at both sides, being preferably constituted by a wire c²
which passes through eyes in the folding halves of the frame to secure them
together to hold the plate between them. The plate holders are charged by
removing the said wire from one side and opening them from the other side
as on a hinge. Into each holder two sensitized plates are placed each with. its
sensitized face outwards, a piece of black paper, or the like, being placed between
the said plates to prevent light from passing through from one plate to the other
during exposure. When the plates and the intervening light obstructor are in
place the holder is closed and secured by the wire being passed through the ears
at the edge of each part as shewn in Figure 4. The inside of the camera body A
and the receptacle for the plates in their holders are provided with grooves d
in which the pins & projecting from the sides of the holders engage, the said grooves
being so ford as to cause the bottom frame and the plates carried thereby,
when withdrawn from beneath the series in the receptacle, to be turned into an
upright position (as shewn at C* in Figure 3) for exposure, and in thus turning
up to move the plate previously exposed and the holder thereof along the con-
tinuations of the grooves dd (as shewn in Figure 2) and force the last named
plate and its holder back into the receptacle to the top of the series of plates in
their holders contained in the receptacle, and so on successively, the plates to be
exposed being drawn out with their holders from beneath the series and after
exposure being returned to the top of the series with the unexposed plate on the
reverse side of the holder in position to be exposed when this holder arrives at the
bottom of the series.
The plates and their holders can be thus operated by means of a bar B normally
retained in position by a spring which is pressed to release the bar which is then
drawn forward the inner ends of the said bar being provided with spring pieces b
engaging behind the lowermost plate holder. By the forward movement of this
bar B the lowerinost plates in their holder are moved forward and the holder thereof
acts upon the lower edge of the holder of the plate previously brought into position
for exposure and moves it partly up the grooves both holders assuming such a
position (as shewn in Figure 2) that when the bar is pushed back again pro-
jections E thereon turn up into a vertical position the holder brought forward
from the eries for exposure the holder which carries the previously exposed plate
being thereby pushed to the top of the series of holders and plates with the exposed
plate uppermost and the unexposed plate in the same holder lowermost, and the
plate to be exposed is supported in an upright position in rear of the lense ready
for receiving the next picture. At each operation an indicator disc F may be
moved by the plate (through the pawl f acted upon by a lever centered
at ) through a part of a rotation so as to expose at an opening a figure shewing
the number of plates which have been exposed.
Owing to the way in which the plates are manipulated as aforesaid one plate
carried in each holder of the series is exposed and after these have all been exposed
the scond plates in each holder are similarly successively exposed so that pictures
are eventually received on the two plates in each holder when the exposed plates
are all removed and fresh or unexposed plates are put in their place, as hereinbe-
fore described.
The arrangement and operation of the plates may be applied to any description
of camera whether binocular or not.

page_text: The plates and holders C can be removed and replaced through an opening,
provided with a cover G at the rear of the upper part of the camera and there may
be a removable door H at the back by which access to the edges of the plate
holders can be obtained. 11 are lenses focussed by a rack and pinion operated
by a screw. The lens I is for exposing the plates and the lens 12 is for projecting
the image on a view finder J. is a brush or pad on a spring for excluding
light from the plates as they are returned to position in their receptacle and whilst
they are therein.
The other part of the camera may be of any suitable or usual construction.
For example the shutters may be movable up and down by levers actuated by
toothed racks with which engage pinions on a shaft which can be operated by a
bead from outside the camera. It can be operated by the same movement which
changes the plates by furnishing the bar by which the plates are changed with a
rack which engages a toothed wheel on the said shaft which is provided with a
spring which is wound up when the plate changing bar is withdrawn and the
aforesaid rack acts ou the pinion. The shutter is retained in position by a spring
catch which can be released from the outside from its engagement which may
be with a notched disc or the said shaft.
By the arrangements described each plate-holder of the same thickness as
ordinary plate holders carries two plates so that the new camera accommodates
twice the number of plates accommodated by other cameras and as the plates
and holders lie horizontally and are brought consecutively into an upright
position for exposure to the focus of the lens, the camera need not be longer than
the principal focus of the lens plus the width of the plate holder whatever be the
number of plates and plate holders, whereas in other cameras in which the plates
are placed vertically one behind the other the more plates the camera contains
the greater must be the length of the camera, but in the new camera the accom-
modation for plates can be increased by simply increasing the height of the reservoir
of the plate holders to the extent of the thickness of any additional number of
plate holders required without increasing the length of the camera.
The arrangement also obviates displacement or slipping of the plates however
much the camera may be jolted.
Having now particularly described and ascertained the nature of this invention.
and in what manner the same is to be performed, I declare that what I
claim is:-
1. Holders for photographic sensitized plates constructed and accommodating
two plates as herein before described.
2. In a photographic camera a receptacle for plate holders in a horizontal
position and grooves in the camera in which projections on the holders
engage and a bar or the like for acting on the holders for moving them into a
vertical position for exposure and then returning them to the top of the series
in the receiver substantially as hereinbefore described.
3. In photographic cameras the arrangement and combination of parts for re-
ceiving the plate holders and presenting each of their sides in the focus of the
lens and returning them to the receiver substantially as hereinbefore described and
illustrated in the accompanying drawings.
Dated this 29th day of Jule 1898.
JOHNSONS & WILLCOX.
47, Lincolns Inn Fields, London, W.C., Agents.