Improvements in Dishes for Development and the like.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Dishes for Development and the like.
PERCY VIVIAN LEVI, 20, Princes Square, London, W., do hereby declare the
nature of this invention to be as follows:-
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The invention consists in methods of protecting the sensitive photographic
plate against the action of light during the processes of development and the
like. To effect this, the developing dish is provided with a special cover of
adiactinic material, as thin metal, opaque celluloid, ruby glass, or any other
appropriate material. A peculiarity of the cover is that three of its edges are
turned over" into the form of inwardly directed grooves, while the fourth
edge of the flat rectangular cover is left uncurled. In the direction of the plane
edge, the cover is made somewhat broader than corresponds with the superficies
of the developing dish it is intended to protect. As the curled or retroverted
edges of the cover correspond with the shape of the projecting lips of the develop-
ing dish, it is evident that after immersing the sensitive plate in the developing,
fixing or other bath, the projection cover may be slided on & thus sufficiently
securely fixed, and when necessary removed again with the utmost facility.
Celluloid and other developing, toning, fixing, etc., dishes are now commonly
made with such expanded lips as are appropriate to the use of the invention; but
alternatively, the dish may be specially made with an inner groove in the upper-
most portions of three sides, while the fourth side is left somewhat shallower, to
admit of the introduction of my sliding cover which, under these circumstances,
would simply consist of a rectangular flat plate, the edges not being "turned
over.
"
Dated this 4th day of September 1899
PERCY V. LEVI,
20, Princes Square, W.
Improvements in Dishes for Development and the like.'
PERCY VIVIAN LEVI, 20, Princes Square, Bayswater, London, W.; Journalist,
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:―
The invention consists in methods of protecting the sensitive photographic
plate against the action of light during the process of development and the
like. To effect this, the developing dish is provided with a special cover of
adiactinic material, either transparent or otherwise (to non-actinic light), as
[Price 8d l

page_text: "
thin metal, opaque celluloid, ruby glass or any other appropriate material. A
peculiarity of the cover is that two or three of its edges are turned over into
the form of inwardly directed grooves, while the third or fourth edge of the
- flat rectangular cover is left uncurled. In the direction of the plane edge, the
cover is made somewhat broader than corresponds with the superfices of the
developing dish it is intended to protect, and as the curled or retroverted edges
of the cover correspond with the shape of the projecting lips of the developing
dish, it is evident that after immersing the sensitive plate in the developing,
toning, fixing or other bath, this protection cover may be slided on, & thus
sufficiently securely fixed, and when necessary removed again with the utmost
facility. Celluloid, and other developing, toning fixing and the like dishes are
now commonly made with such expanded lips as are appropriate to the use of
my invention but, alternatively the dish may be specially made with an inner
groove in the uppermost portion of either two or three sides, whilst the fourth
or third & fourth side is made somewhat shallower. to admit of the introduction
of my sliding cover, which under these circumstances would simply consist of
a rectangular flat plate, the edges not being "turned over."
In order that my invention shall be more fully understood I will proceed to
describe one form of the same with reference to the accompanying sheet of
drawings in which Figs. 1 & 2 are sections at right angles to one another of a
developing dish with the cover applied. In both drawings C is the sliding
cover, shewn in transverse section, D D, in Fig. 1, and in longitudinal section
at E E, Fig. 2, A A, (Fig. 1) being a transverse, and B B, (Fig. 2) a longitudinal
section of the developing dish. The lateral. edges or lips of the developing dish,
embraced by the downwardly inward portions of the cover will be seen at D D,
Fig. 1, while the straight or flat ends of the cover, permitting it to be slidden on
to the edges of this developing dish from either end thereof, will be seen at E E,
Fig. 2. The direction E E is of course that in which this protection cover is to
be slidden into its position on the dish, as shewn.
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―
A dish or tray for developing, toning, fixing, and the like in photography,
provided with a lid for the purpose of excluding actinic light, constructed sub-
stantially as described.
Dat da.. of M 1000