An Improved Developing Tray or Dish for Photographic Purposes.
Year: 1892

page_text: Date of Application, 26th May, 1892
Complete Specification Left, 4th Aug., 1892-Accepted, 10th Sept., 1892
PROVISIONAL SPECIFICATION.
An Improved Developing Tray or Dish for Photographic Purposes.
I, ANDRÉ DESBOUTIN, of 70, Thurlow Hill, West Dulwich, in the County
of London, Gentleman, do hereby declare the nature of this invention to be as
follows:-
My invention relates to the novel construction of tray or dish for devoloping
photoghraphic plates or films whereby I am enabled to dispense with the use of a
special dark room.
In carrying out my invention I provide a dish proper of papier mâché or
other suitable material, the said dish at one end being provided with a spout.
This dish proper is provided with a closely fitting lid having in it a sheet of
glass of a non-actinic colour, say yellow, and in the bottom of the dish proper
I insert another sheet of glass of, say, a red colour. Across the end of the dish
having the spout I form a screen which serves to prevent any light from entering
the dish or tray through the aperture between the spout and the dish.
Dated the 26th day of May 1892.
G. F. REDFERN' & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improved Developing Tray or Dish for Photographic Purposes.
I, ANDRÉ DESBOUTIN, of 70, Thurlow Hill, West Dulwich, in the County
of London, Gentleman, 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 the novel construction of a tray or dish for developing
photographic plates or films whereby I am enabled to dispense with the use of a
special dark room.
In carrying out the said invention. I provide a dish proper of papier mâché or
other suitable material and having a spout. This dish proper is provided with a
closely fitting lid having in it a sheet of glass of a non-actinic colour, say yellow,
and in the bottom of the dish proper another sheet of glass also of non-actinic
colour, say red, is inserted. Across the part of the dish having the spout I form a
screen which serves to prevent any light from entering the dish or tray through the
aperture between the spout and the dish.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawings, in which :-
Figure 1 is a plan view of my improved developing tray or dish; and
Figures 2 and 3 are sections on the lines x x and y y respectively of Figure 1 ;
Figure 4 is a plan view illustrating a developing tray or dish of a slightly different
form; and
Figures 5, 6 and 7 are sectional views on the lines x³ ³, y¹y' and z = respectively
of Figure 4.
Similar letters of reference indicate corresponding parts in the several figures.
a indicates the tray or dish proper, and 6 the spout thereof, the only
communication between the spout and the interior of the tray or dish being
through the aperture or opening c. d is the lid or cover which accurately fits
the walls of the tray or dish so as to prevent the entrance of light around the
joint.

page_text: e is the glass in the bottom of the vessel proper In practice I prefer to make
this glass to cover the whole of the bottom of the dish, an opening of the required
size being formed in the material of which the dish is composed.
9 is the glass which covers the opening in the lid or cover.
is the screen
which is placed opposite to the aperture c in order to prevent the entrance of
light through the said aperture into the vessel. This screen does not extend into
contact with the side walls of the vessel but terminates a short distance therefrom
so as to leave spaces j, j through which the liquid can pass from the spout to the
interior of the dish or vice versa.
In the arrangement of my invention shewn in Figures 1, 2 and 3, the spout bis
represented as being formed at one end of the tray or dish and the aperture c
is formed in one of the end walls of the latter; as, however, a developing tray or
dish of this form might in some cases be considered objectionable, for instance,
when the said tray or dish is to form part of a portable apparatus, I have
provided the arrangement shewn in Figures 4 to 7 in which the spout is at
one corner of the tray or dish. In this case the aperture is formed in a supple-
mentary wall a¹ placed across the corner of the said vessel and the screen i is also
placed cornerwise, as shewn, to prevent the entrance of light through the said
aperture.
In using my improved developing tray or dish I proceed as follows, that is to
say, I transfer the negative from the dark slide to the developing tray or dish in an
ordinary changing bag or under an improvised covering such as a coat or railway
rug, which must be impervious to the passage of light, the sensitive side of the
plate being uppermost; the lid or cover is then placed over the tray or dish and
the dark slide is placed upon the lid in order to cover the glass therein, the whole
is then withdrawn from the bag and the developing solution is poured into the tray
or dish through the spout: the operator then gently oscillates the whole apparatus
for a time which he considers sufficient and then pours off the solution; by
removing the dark slide and holding the developing tray or dish up before the
flame of a candle or lamp the operator can at once see whether the development
has proceeded far enough.
Having now particularly described and ascertained the nature of my said inveu-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A developing tray or dish having an opening formed in the bottom thereof
covered by glass of non-actinic colour and provided with a lid also containing an
opening covered by glass of non-actinic colour, the said vessel being also provided
with a spout communicating with the interior of the vessel through a hole or
aperture opposite to which is placed a screen for preventing the entrance of light
into the tray or dish, all substantially as described.
2. A developing tray or dish for photographic purposes having a lid and openings
covered by glass of non-actinic colour in the bottom of the vessel and in the lid,
one end of the tray or dish being provided with a spout and with a screen for
preventing the entrance of light through the hole between the interior of the dish
and the spout, substantially as described by reference to Figures 1 to 3 of the
accompanying drawings.
3. A developing tray or dish for photographic purposes of the kind hereinbefore
described and provided with a spout at one corner, the aperture establishing
communication between the interior of the dish and the spout being formed in a
supplementary partition and provided with a screen, substantially as described by
reference to Figures 4 to 7 of the accompanying drawings.
Dated the 4th day of August 1809
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.