Improvements in Photographic Dark Backs for Successive Exposures for the Purposes of Color Photography.
Year: 1897

page_text: Date of Application, 4th May, 1897
Complete Specification Left, 28th June, 1897-Accepted, 31st July, 1897
PROVISIONAL SPECIFICATION.
Improvements in Photographic Dark Backs for Successive Exposures
for the Purposes of Color Photography.
I, GUSTAV SELLE, of Brandenburg on the Havel, in the Empire of Germany,
Physician, do hereby declare the nature of this invention to be as follows:-
This invention relates to a multiplicator dark back which is especially intended
for receiving sensitive plates for the production of negatives for colored photo-
graphs. This case is distinguished from the usual multiplicator cases by light
filters being arranged before the plates, so that by simply displacing the case
not only the plate but also the light filter is changed. By means of the quick
succession of photographs of the same object effected in this manner it is
possible to take successive views of living beings without difficulty suitable for
the process of color photography. The arrangement of the light filters closely
before the sensitive plates in a multiplicator dark back for the production of colored
photographs, has also the advantage that the different refraction of the variously
colored filters will no longer unfavourably influence the coincidence of the pictures
when laid over one another.
In the annexed drawing is shown an example of such an apparatus, by means
of which such photographs can be produced. Fig. 1 is an elevation and Fig. 2
a sectional plan of such dark back. Fig. 3 is a cross section on line 3-3 Fig. 2,
and Fig. 4 is a sectional plan of a modification.
As Fig. 1 shows, the case a is divided into 3 parts and is displaceable in a
guiding frame b. The guiding frame b can, as shown in Fig. 2 be connected
permanently with the apparatus A, or as shown in Fig. 4 it can be secured
temporarily for instance by means of a groove and feather.
When the guiding frame b, is connected permanently with the apparatus it is
provided with a slot c, which can always remain open, in order to give to
the projected light access to the sensitive plates. The case is divided into 3 parts
by means of bars . Each of these parts has towards the apparatus a slide e
which can be conveniently pulled upwards. Behind the slide, are the light
filters f, which when necessary will be preferably exchanged from above. Closely
behind the filters f. are the sensitive plates q, which are conveniently seated in
inetal angles m, and can be taken out through a common door h, and are pressed
on the metal angles m, by means of springs i, when the door h, has been closed.
The guiding frame b, is shown in Fig. 3 in cross section: it is closed below
open above and provided with a bar k, which prevents the dark back from falling
out. The cross bars L prevent the back from being pulled out while the
slides e, are pulled up so that the latter must be closed under any circumstances
before the back a, is pulled out of the guiding frame b.
To remove the case and the guiding frame b, together as is shown in Fig. IV,
it is only necessary to provide the opening c. of the latter with a slide E: the
single slides for each division can then be dispensed with as the wall 7, of the
framing b, lying towards the apparatus closes the sensitive plates on the front.
Price 8d】

page_text: Otherwise the case is constructed in the same manner, as that shown in Figs. I,
II and III. The case can be slid forwards during the 3 exposures by hand or
automatically.
Dated this 4th day of May 1907
HERBERT HADDAN & Co.,
8, Buckingham Street, Strand, W.C., London, Agents to Applicant.
Improvements in Photographic Dark Backs for Successive Exposures
for the Purposes of Color Photography.
I, GUSTAV SELLE, of Brandenburg on the Havel, in the Empire of Germany,
Physician, 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 a multiple slide which is especially intended
for receiving sensitive plates for the production of negatives for colored photo-
graphs. This case is distinguished from the usual multiple slide cases by light
filters being arranged before the plates, so that by simply displacing the case
not only the plate but also the light filter is changed. By means of the quick
succession of photographs of the same object effected in this manner it is
possible to take successive views of living beings without difficulty suitable for
the process of color photography. The arrangement of the light filters closely
before the sensitive plates in a multiple slide for the production of colored
photographs, has also the advantage, that the different refraction of the variously
colored filters will no longer unfavourably influence the coincidence of the pictures
- when superimposed.
In the drawing left with my provisional specification is shown an application
of my invention and an example of an apparatus, by means of which such photo-
graphs can be produced. Fig. 1 is an elevation and Fig. 2 a sectional plan of such dark
slide, Fig. 3 is a cross section on line 3-3 Fig. 2 and Fig. 4 is a sectional plan of
a modification.
As Fig. 1 shows, the case a is divided into three parts and is displaceable in
a guiding frame b. The guiding frame can, as shown in Fig. 2, bo connected
permanently with the apparatus A, or as shown in Fig. 4 it can be secured
temporarily for instance by means of a groove and feather.
When the guiding frame is connected permanently at an aperture c, which
can always remain unobstructed, in order to give to the projected light access
to the sensitive plates. The case a is divided into three parts by means of bars d.
Each of these parts has towards the apparatus a slide e which can be con-
veniently pulled upwards. Behind the slide e are the light filters f which when
necessary will be preferably exchanged from above. Closely behind the
filters are the sensitive plates g which are conveniently seated in metal angles m
and can be taken out through a common door h and are pressed on the metal
angles m by means of springs i when the door h has been closed.
The guiding frame b is shown in Fig. 3 in cross section: it is closed below,
open above,, and provided with a bark which prevents the dark slide from falling
out. The cross bars L prevent the slide from being pulled out while the slidės e
are pulled up so that the latter must be closed under any circumstances before the
back is pulled out of the guiding frame b.
To remove the case and the guiding frame b together as is shown in Fig. 1.

page_text: it is only necessary to provide the opening of the latter with a slide E; the
single slides for each division can then be dispensed with as the wall of the
framing 6 lying towards the apparatus closes the sensitive plates on the front.
Otherwise the case is constructed in the same manner, as that shown in Figs. 1, 11
and III. The case can be slid forwards during the three exposures by hand or
automatically.
It is obvious that without varying the object of my invention the mode of
execution may be variously modified and I do not limit myself to the illustration
aforegiven but:-
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. In three color photography the use of a dark slide combining in one frame
a sensitised plate faced closely by a color filter for the purpose as herein described.
2. In three color photography the use of adjoining slides containing sensitised
plates and color filters for the purpose of successive exposures.
3. In three color photography the successive exposure by means of a slide
carrier of 3 slides containing sensitised plates and color filters.
4. Apparatus for use in connection with three color photography substantially
as herein described.
Dated this 28th day of June 1897
HERBERT HADDAN & Co.,
18. Buckingham Street, Strand, London, Agents to Applicant.