Improved Photographic Developing Apparatus.
Year: 1897

page_text: Date of Application, 18th Sept., 1897
Complete Specification Left. 4th June 1898-Accented 27th Aug.
1898
AUDIONAL DEVITICATION.
Improved Photographic Developing Apparatus.
I, ALBERT STEFAN COBENZL, of Hoechst-on-Main, in the Province of Hesse-
Nassau, Germany, Chemist, do hereby declare the nature of this invention.
to be as follows:
This invention has for object to provide an apparatus whereby photographic
negatives, etc., taken on tour or otherwise may be developed and fixed without the
use of a dark room.
The apparatus consists of a developing tray covered on top for a portion of its
length to which end are connected inlet and outlet pipes for the solutions bent at
right angles and having a common filling and emptying mouth closed by a stopper
whereby the pouring in and out of the solutions may be effected without access of
light. The tray is enclosed by a hinged cover with flanged sides embracing those
of the tray, this cover consisting for about two-thirds of its length of a frame fitted
with superposed red and orange glass plates forming a window for lighting the
interior of the tray. To exclude unnecessary light, the window is provided with
a sliding shutter and is enclosed by a hinged lid. The other part of the cover is
domed and provided on its inclined side with binocular eye-pieces covered inside with
an orange plate and closed by a sliding shutter which is only opened during
observation.
The apparatus is used as follows:-By means of a light-excluding sleeve the
plate is introduced into the tray, the shutters of the window and eye-pieces being
closed, whereupon the developer is introduced in open light through the filling
orifice and when it is desired to observe the progress of development the slide of
the window is drawn with one hand and the eyes are applied close to the eye-pieces.
The shutter of the sight holes is then opened with the other hand whereby the
operation can be sufficiently observed. When development is complete the developer
is poured off and the fixing solution introduced, and after the time deemed
necessary for fixing the plate can be removed.
Dated this 18th day of September 1897
Improved Photographic Developing Apparatus.
•
I, ALBERT STEFAN COBENZL, of Hoechst-on-Main, in the Province of Hesse-
Nassau, Germany, Chemist, do hereby declare the nature of this invention
Price 8d1

page_text: 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 object to provide an apparatus whereby photographic
negatives, etc., taken on tour or otherwise may be developed and fixed without the
use of a dark room.
The apparatus, which is illustrated in longitudinal vertical section in the accom-
panying drawing forming part of this specification, consists of a developing tray
or box A having a permanent cover a extending over about one-third of its length
from the back end. To this end of the box are connected inlet and outlet pipes B
for the solutions bent at right angles and having a common filling and emptying
mouth b closed by a stopper whereby the pouring in and out of the solutions may
be effected without access of light to the interior of the developing tray. The
tray is provided with a cover Chinged at c¹ to the back end of the tray, the cover
extending over and enclosing the whole top of the tray, the cover having down-
wardly projecting flanged sides c which closely embrace the sides of the tray, this
cover consisting for about two-thirds of its length of a frame fitted with super-
posed red and orange glass plates D forming a window for lighting the interior
of the tray. To exclude unnecessary light, the window is provided with a
sliding shutter E and is enclosed by a lid hinged at f. The forward part of the
cover C is formed with a rising domed portion, as at C, the inclined front side of
the dome having binocular eye-tubes G fitted, with an orange plate 9 and closed
by a sliding shutter g¹, which is only opened during observation. The position of
the eye-tubes on the domed part of the cover is such as to afford a view of the
whole plate undergoing development.
The apparatus is used as follows:-By means of an ordinary light-excluding
sleeve bag the plate is introduced into the tray, the cover C being raised for the
purpose as shewn in. dotted lines. The cover C being closed and the shutters E
and g¹ being also closed the developer may be introduced in open daylight through
the filling orifice band when it is desired to observe the progress of development,
the slide E of the window is drawn out as indicated in dotted lines with one hand
and the eyes being applied close to the eye-pieces, the shutter g of the sight
holes is opened with the other hand whereby the operation can be sufficently
observed. When development is complete, the developer is poured off and the
fixing solution introduced and after the time deemed necessary for fixing, the
plate can be removed.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
The herein described apparatus for developing photographs, consisting of a
tray with hinged light-tight cover and fitted with non-actinic windows for light-
ing the tray and viewing the interior and with shutters for closing such windows,
the tray being provided with means for introducing and pouring off the solutions
under light excluding conditions, substantially as specified.
Dated this 4th day of June 1898
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.