Improvements in Photographic Cameras and Changing Bags.
Year: 1899

page_text: Date of Application, 27th Oct., 1899
PROVISIONAL SPECIFICATION.
Improvements in Photographic Cameras and Changing Bags.
I, MAGNUS NIELL, of Maze Lodge, Forest Road, Kew, near London, Engineer,
do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in photographic apparatus, and has
for its object the production of a simple apparatus for changing sensitized
plates or films and of a camera specially suitable for use with the aforesaid
apparatus.
For changing sensitized plates or films, placed in succession one on another,
comparatively complicated and bulky devices have hitherto been required.
The first part of this invention consists in a changing bag which is of very
simple construction, is very easily manipulated, occupies small space and enables
the films to be readily carried after exposure without any further operation.
The essential feature of this part of my invention is that a kind of bag is
formed of opaque material, divided into two parts, one of which carries the
sensitized films placed flat one on top of another before exposure, whilst the
other part holds the films after exposure, the films being drawn from the first
part to the second after each film has been exposed.
The first part of the bag which is usually the upper part is enclosed in a
frame and Loth of these are open in the front, and the opening is suitably
covered so that the front plate may be exposed when desired.
The bag with its frame is carried in a small case which may be part of a
camera. To insert the bag in the case it is folded at its centre so that the two
parts lie side by side. The frame serves for guiding and tightening the bag
inside the case. The films are separated from each other by a layer of suitable
opaque material.
In order that the films may be changed after their exposure, from the upper
to the lower part of the bag, each film is provided with a tag which is guided
in, and always projects through, the bottom of the bag. This tag is pulled
when any film has to be drawn down. The tags pass through a slot in the
bottom of the bag which is arranged so that no light can pass through it and act
on the films. In order that, while pulling down the front film the one next it
may not also be pulled down by friction, each film is separately fixed in a
light and suitable manner, for instance by fastening it with tissue paper to the
top edge of the upper part of the bag, so that enough force must be exerted on
each film to break this fastening before the film can be drawn down. To
transfer a film from the first to the second part of the bag, the latter must of
course be withdrawn from the case.
The second part of my invention consists in an improved form of camera
specially adapted for use with my plate-changing apparatus. This camera is
of very simple construction, is very light, is easily manipulated and folds into
very small bulk.
The front of the film holding case
hinged to the case at its lower edge and

page_text: its top end is pivotally attached to the lens carrier so that the lens, which, when
the camera is closed, lies on top of the case, can be swung out till its axis is
horizontal. To limit the motion of the lens carrier, it has at each side a slotted
bar the slots of which work on pins in the-sides of the case: When folded up,
the front of the case and the lens are held in place by 'suitable clips; but, when
these clips are freed, the front of the case is forced open and the lens swung
out by means of a suitable spring. At the same time a view centering device
opens up. This may be formed of two crossed wires or fibres and a plate
carrying a sighting hole. The view centering device is provided with springs
causing it to rise automatically whenever the case is opened. The bellows
extends from the lens carrier to the edges of the case.
1.
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በሰባ
1000.
MARKS, & CLERK,
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham, and
... I 25, Cross Street, Manchester, Agents.
..
:..
*
... * 2x7
دورة
"
COMPLETE SPECIFICATION..
41+
Improvements in Photographic Cameras and Changing Bags...
I, MAGNUS NIELL, of Maze Lodge, Forest Road, Kew, near London, Engineer,
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 relates to improvements in photographic apparatus, and has
for its object the production of a simple apparatus for changing sensitized
plates or films and of a camera specially suitable for use with the aforesaid
apparatus.
For changing sensitized plates or films, placed in succession one on another,
comparatively complicated and bulky devices have hitherto been required.
The first part of this invention consists in a changing bag which is of very
simple construction, is very easily manipulated, occupies small space and enables
the films to be readily carried after exposure without any further operation.
The essential feature of this part of my invention is that a kind of bag is
formed of opaque material, divided into two parts, one of which carries the
sensitized films placed flat one on top of another before exposure, whilst the
other part holds the films after exposure, the films being drawn from the first
part to the second after each film has been exposed.
The second part of my invention consists in an improved form of camera
specially adapted for use with my plate changing apparatus. This camera
which will be described hereafter is of very simple construction, is very light,
is easily manipulated and folds into very small bulh..
Referring now to the accompanying drawings which illustrate one modifica-
tion of my invention.
Figure 1 is a perspective view of the changing bag.
Figure 2 is a section of the same....
Figure 3 is a back elevation of part of the same with one of the tags pulled
down.
Figure 4 illustrates the bag doubled up.
Figure 5 shows the camera with the lens carried extended and the back of
the case open.
Figure 6. shows the camera closed.

page_text: The changing bag consists of an upper part a in which the films are held
before and during exposure and a lower part 6 in which they are retained
after exposure. The upper part a is enclosed in a frame d, and both a and d
are open in the front to allow of the exposure of the films. The opening is
covered by a protecting sheet or cover, which is removed when it is desired
to expose the front film.
In order that each film after exposure may be transferred from the upper to
the lower part of the changing bag, I provide each film with a, tage which is
guided in and always projects through the bottom of the bag. This tag is
pulled when it is desired to draw down any film: The tags pass through a
slot in the bottom of the bag which slot is arranged so that no light can pass
through it and act on the films. In order that, while pulling down the front
film, the one next it may not also be pulled down by friction, each film is sepa-
rately fixed in a light and suitable manner, for instance, by fastening it with
tissue paper to the top edge of the upper part of the bag, so that enough force
must be exerted on each film to break this fastening before the film can be
drawn down. The films are separated from each other by a layer of suitable
opaque material. The bag with its frame is carried in a small case g (see
Figure 5) which may form part of a camera. To insert the bag into the case d,
the bag is folded at its centre e so that the two parts lie side by side.
frame serves for guiding and tightening the bag inside the case.
must of course be withdrawn from the case g in order to transfer a film from
the upper to the lower part of the bag.
The
The bag
The camera which forms the second part of my invention is shown in Figures 5
and 6.
The case g forms part of this camera and has its front plate f hinged to it
at the bottom. The back of the case is also hinged at the bottom, and can be
opened for the insertion of the changing bag. The top edge of the front plate f
is pivotally attached to the lens carrier so that the lens, which, when the
camera is closed, lies on the top of the case, can be swung out till its axis is
horizontal. To limit the motion of the lens carrier, it has at each side a slotted
bar h, the slots of which work on pins in the sides of the case g. When folded
up, the front plate f and the lens carrier k are held in place by suitable clips m;
but when these clips are freed by pressure exerted on the projections the front
plate is forced open and the lens carrier swung out by means of a suitable
springs. At the same time a view centering device opens up. This may be
formed of two crossed wires or fibres o and a plate p carrying a sighting hole q.
This view centering device is forced up into position by a suitable spring t
whenever the front plate f and lens carrier k are swung out. The bellows
extends from the lens carrier to the edges of the case g.
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:-
1. A changing bag for photographic plates or films consisting of opaque
material divided into two parts one of which carries the sensitized films before
and during exposure and the other part the films after exposure, the films being
drawn from the first to the second part by tags attached to the films and pass-
ing through a light-tight slot in the bag, substantially as described.
2. In a changing bag as claimed in Claim 1, attaching the films by tissue
paper or some such easily-torn material to the bag, so that when one film is
pulled to the other part of the bag, the film next may not also be drawn by
friction.
3. The combination with a changing bag as claimed in Claim 1 of a frame
such as d and a case such as g, substantially as and for the purpose described.
4. A photographic camera having a case adapted to contain a bag of films
and a front plate pivoted at its lower edge to the case with a lens carrier pivoted

page_text: to the top edge of the front plate and connected to the case by slotted bars
which work on pins fixed to the case, so that the front plate and lens carrier
can swing out into an operative position, substantially as described.
5. In a photographic camera as claimed in Claim 4, a view centering device
adapted to be forced into an operative position by a spring when the front plate
and lens carrier are swung out, substantially as described.-
6. The folding camera substantially as described and as illustrated in the
accompanying drawings.
Dated this 19th day of June 1900.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., Agents.