Improvements in or connected with Photographic Apparatus.
Year: 1892

page_text: Date of Application, 3rd Dec., 1892
Complete Specification Left, 26th Sept., 1893-Accepted, 28th Oct., 1893
PROVISIONAL SPECIFICATION.
Improvements in or connected with Photographic Apparatus.
A communication by SALOMON HIRSCHFELDER and LOUIS DANNHAUSER, of
46, Karlstrasse, Munich, in the Empire of Germany, Artist and Merchant,
respectively.
1, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E. of the Agency for
Foreign Patent Solicitors, 6 Lord Street, Liverpool, and 6 Bank Street, Manchester,
both in the County of Lancaster, and 323 High Holborn, in the County of Middlesex,
Civil Engineer, do hereby declare the nature of this invention to be as follows:-
In this photographic apparatus the exposure of the plate does not take place
simultaneously on its entire surface but an exposure slit is arranged along the plate
by means of which the ray of light coming from the objective always falls at a
right angle to the plate from one end to the other of the same, which considerably
increases the intensity of the exposure. This apparatus works like the most rapid
instantaneous shutter, which renders necessary the application of an adjustable
checking device for time exposures.
In this apparatus a carrying piece is attached crosswise to each of the cross
parts of a square frame, between the front ends of which a smaller frame is
movably arranged and held by means of pins. These latter are provided with
little rollers inside the small frame, between which rollers an exposure chamber is
arranged which has a vertical light slot or opening, and by means of its guide
ledges may be moved backwards and forwards. The exposure chamber is at its
slot or opening fixed in the middle of a suitably slotted board or the like, of at
least double the length of the slide (plate holder). This board is adjustably
arranged in the U-shaped guides of the slide holder, whilst this latter as well as
the slide is movably attached to the rear ends of the support by means of pins.
A plate closing slide is secured at both ends of the suitably slotted board which
has also a slot corresponding to the chamber, and is moved with the adjustment of
the board, or the ordinary box slide (without slot) may be employed which in this
case is attached to one end of the board. At the right edge of the plate carrier
and at the left edge of the board in the above described form of the apparatus a
draw-strap of indiarubber or the like is attached, which has a tendency to draw
the plate holder, which may be made of cloth, sheet metal, etcetera, and single or
double, into its normal position. The setting of the apparatus (which must be
The board is
done with the objective closed) takes place in the following manner.
taken hold of at the right hand end and it is endeavoured to push it into the
frame, by which the indiarubber band is suitably stretched. The more then the
exposure slot of the chamber approaches the pivot of the plate holder, the more
will the chamber and therewith the objective be drawn back correspondingly, in
order after crossing the pivot to again emerge from the frame, when the case with
its ledges passes between the rollers of the frame and the plate holder, or the
board with the slide comes into the opposite position: A stop catch arranged on
the left side wall of the chamber when the apparatus is set, engages with an easily
released catch or like device arranged on the frame, and holds the apparatus with
the band stretched; this may however be performed in some other suitable
manner. The release of the latter may be effected by a pneumatic device, or in
other suitable manner, whereupon the indiarubber band or spring contracts with
the greatest rapidity and thereby the board with the exposure slot of the case is
carried with the greatest rapidity back into the U-shaped holders of the plate
carrier into its original position, whilst the slide again shuts the plate in its holder

page_text: in a manner impervious to light. The slot of this slide stands behind the plate
holder frame whether it is in a normal position or when the apparatus is under the
tension of the band. If hooks for the indiarubber band be arranged at both ends
of the plate holder or of the board, the exposure slot, when taking a picture, may
-be passed along the plate from. right to left or vice versa, according as the india-
rubber band is engaged with one pair of hooks, and thus draws the apparatus to
the right or left. For this purpose the plate holder slide has proved to be very
advantageous.
The exposure of the plates takes place as already stated, instantaneously, and it
may be suitably delayed by means of a pump, screw spindle, clockwork or the
like mechanism, according to requirements for time exposures.
Dated this 2nd day of December 1892
WM. P. THOMPSON & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or connected with Photographic Apparatus.
A communication by SALOMON HIRSCHFELDER and LOUIS DANNHAUSER, of
46, Karlstrasse, Munich, in the Empire of Germany, Artist and Merchant,
respectively.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for
Foreign Patent Solicitors, 6 Lord Street, Liverpool and 6, Bank Street,
Manchester, both in the County of Lancaster and 323, High Holborn, in the
County of Middlesex, Civil Engineer 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:-
In this photographic apparatus, the exposure of the plate does not take place
simultaneously on its entire surface or length but an exposure slit is arranged
along the plate by means of which the ray of light coming from the objective
always falls at a right angle to the plate from one end to the other of the same,
which considerably increases the intensity of the exposure. This apparatus works
like the most rapid instantaneous shutter, which renders necessary the application
of an adjustable checking device for time exposures (this is not shown on the
drawing).
The apparatus is shown on the accompanying drawing, in Figure 1 in horizontal
section:
Figure 2, vertical section; and
Figure 3 a detail.
In this apparatus, a carrying piece b is attached crosswise to each of the cross
parts of a square frame a, between the front ends of which a smaller frame c is
movably arranged and held by means of pins d, Figure 2: These latter are
provided with little rollers e inside the small frame c, between which rollers an
exposure chamber is arranged, which has a vertical light slot or opening h, and,
by means of its guide ledges g, may be moved backwards and forwards. The
exposure chamber is, at its slot or opening, fixed in the middle of a suitably
slotted board or the like, of at least double the length of the slide (plate holder) k.
This board is adjustably arranged in the U-shaped guides of the slide holder,
Figure 2, whilst this latter, as well as the slide, is movably attached to the rear
ends of the support 6 by means of pins m. A plate closing slide n is secured at
both ends of the suitably slotted board i, which has also a slot h₁ corresponding to
the chamber, and is moved with the adjustment of the board i,, or the ordinary
box slide (without slot) may be employed, which,, in this case,, is attached to one
end of the board. At the right edge of the plate carrier, at o (Figure 1), and
at the left.edge o' of the board in the above described form of the apparatus, a

page_text: draw-strap p of indiarubber or the like is attached, which has a tendency to draw
the plate holder, which may be made of cloth, sheet metal, etcetera, and single or
double, into its normal position, as shown on the drawing in full lines. The setting
of the apparatus (which must be done with the objective closed) takes place in the
following manner :-
The board i is taken hold of at the right hand end, and it is endeavoured to
push it into the frame 1, whereupon the indiarubber band p is suitably stretched,
Figure 1. The more, then, the exposure slot of the chamber approaches the
pivot m of the plate holder (following the dotted curved line), the more will the
chamber and therewith the objective be drawn back corresponding to this curved
line (into the dotted position) in order, after crossing the pivot m, to again emerge
from the frame c in the same manner when the case with its ledges 9 passes
between the rollers e of the frame c and the plate holder, or the board with the
slide comes into the opposite position. A stop catch g, Figure 1, arranged on the
left side wall of the funnel-shaped chamber when the apparatus is set, engages
with an easily released catch or like device arranged on the frame a, and holds
the apparatus with the band stretched; this may, however, be performed in other
suitable ways. The release of the latter may be effected by a pneumatic device,
or in other suitable manner, whereupon the indiarubber band or spring p contracts
with the greatest rapidity, and thereby the board i, with the exposure slot of the
case, is carried with the greatest rapidity back into the U-shaped holders of the
carrier of the plates into its original position, whilst the slide n again shuts
the plate s in its holder in a manner impervious to light. The slot ¹ of this
slide stands behind the plate holder frame whether it is in a normal position or
when the apparatus is under the tension of the band. If hooks for the indiarubber
band be arranged at both ends of the plate holder or of the board i, the apparatus
or the exposure slot, when taking a picture, may be passed along the plate from
right to left or vice versa, according as the indiarubber band is engaged with one
pair of hooks, and thus draws the apparatus to the right or left. For this
purpose, the plate holder slide, shown in Figure 1, has proved to be very
advantageous.
The exposure of the plates takes place, as already stated, instantaneously, and
it may be suitably delayed by means of a pump, screw spindle, clockwork or the
like mechanism, according to requirements for time exposures.
Figures 4, 5 and 6 show a modification of the apparatus herein before described.
It relates to the placing of the objective chamber and its movement when
using the apparatus.
The chamber and the plate holder / are, in this case, no longer arranged below
and above in a cross hoop a b, but more on the under side on a simple narrow
wood plate. Figure 4 shows a plan view of this. The fixed axis also, on which
the chamber moves when working, is shifted from the slide holder to the rear
pin d which supports the objective, (see Figure 5, being a longitudinal section) by
which means the chamber, when in work, no longer moves backwards and
forwards. This axis then consists of a holder d' and a pin d, which revolves in d¹
and is attached to the extensible objective chamber. The rollers e and guide
bars g are thus entirely dispensed with and also the small frame c.
In order to allow of the drawing out or suitable adjustment of the objective, its
support d d' is not attached to the plate a but on a slide a moving on the latter
and capable of being fixed thereto.
By moving the point where the chamber is pivotted, from the plate holder 1 to
the chamber itself, this latter requires another kind of support. This consists of
two barsj of flat iron or the like, which are attached by one end to the plate a
by means of a common pivot j', see Figure 6, partial front view. The other ends
of these bars are jointed to the plate holder i by means of pins, and form, to
a certain extent, the actual support.
The position shown in dotted lines in Figure 4 is the normal position of the
apparatus, that shown in full lines is the central position of the same. In the

page_text: latter, the barsj form an extended angle, in the former, in the operating position,
a shortened angle. In order to render this possible, one arm must be able to
be adjusted on its support pin 2, for which object a small slot is formed in the
arm.
In order to facilitate the folding up of the apparatus, the bars may, as shown
in the drawing, be also fixed on a slide a² of the plate a, and this slide may be
made so that it will remain adjusted of itself. This is, however, of only secondary
importance. This mode of construction, simplified in the manner hereinbefore
described, works equally as well as the one previously described, and has the
advantage over the latter of being much lighter and more cheaply constructed.
It is also provided with a novel arrangement for closing the plate holder or slide i
so as to be impervious to light. This consists of an elastic tube v, Figure 5,
inserted in the slide carrying frame l', which tube is filled with compressed air. It
is covered, at the frame l', with a fine cloth or the like v¹.
It is evident that, when a slide is inserted in the holder 1, the pneumatic tube v
will fit very tightly on all parts or points of the same, and so form an absolutely
light-proof closing. The plate i, in the slide frame, may be closed in a similar
way, so as to be impervious to light.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me
by my foreign correspondents, I declare that what I claim is :-
1. A photographic apparatus with oscillating objective chamber for flat plates,
characterised by a plate holder k being movably arranged in a frame or holder a b,
whilst the objective chamber is connected, on the one hand, with a slide
travelling in guides of the plate holder, provided with an exposure slot h, and
moved by means of an elastic band p, on the other hand, however, is held in
movable rollers e arranged in the holder a bin such a way that the objective
moves backwards and forwards when the slide i is moved sideways.
2. In the photographic apparatus with an oscillating objective chamber described
in Claim 1, the replacement of the holder a 6 for holding the plate holder and
the objective chamber, by a plate and two bars j and an adjustable axis, on
which latter, when the apparatus is in use, the objective chamber moves with
the slide i.
3. In the apparatus described in Claim 2, in order to obtain a closing of the
slide and plate holder so as to be impervious to light, the arrangement of a
pneumatic tube v on the frame l' carrying the plate holder.
Dated this 25th day of September 1893.
WM. P. THOMPSON & Co.,
Agents for the Applicant.