An Improved Dish or Case for use in Photographic Development or other Process.
Year: 1892

page_text: Date of Application, 9th Dec., 1892-Accepted, 14th Jan., 1893
COMPLETE SPECIFICATION.
An Improved Dish or Case for use in Photographic Development or
other Process.
I, HARRY RAYNER of 27 Francis Street New Leeds, Leeds, Yorkshire, Maltster
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 object of this invention is to construct a covered dish or case in or within
which a photographic plate or film may be exposed to the action of a developing or
other agent or any similar process be carried on which requires to be performed in
a non actinic light, so that by employment of the improved dish or case, which is
made so that it is not affected by the chemicals used, any process of this nature may
be carried on under inspection without the necessity of having recourse to a so called
"dark" room or chamber into which actinic light is not suffered to enter.
The improved dish or case comprises an inner dish preferably made rectangular
and consisting of a bottom and sides, the whole being made of glass in one piece
and properly annealed. Near or at one corner is a projecting lip, open above, its
upper edge being preferably about level with or a little above the level of the upper
edges of the sides of the said inner dish. This lip or spout has free communication
with the interior of the dish and serves for receiving the developer or other liquid
which is poured into the dish and for emptying the same therefrom. A vertical
inner wall or screen likewise of glass lies in front of the lip inside the dish and
extends from the floor of the dish up to a level with the side walls thereof, and
from the side wall of the dish next to which the lip is made for some distance
parallel with the wall on which the lip is made, extending past the lip and terminating
so as to leave a passage way between it and the wall for entrance or exit of the
liquid from or to the lip. This screen is intended to intercept the actinic rays of
light which might enter at the lip. The whole inner dish may be made of ruby or
other non-actinic glass (that is to say glass which prevents passage of actinic rays
while permitting of the passage of visual rays or a certain quantity or amount of
the visual rays), or only the floor and the screen may be made of such non-actinic
glass.
The inner dish aforesaid is enclosed within an impervious frame which will
usually be made of tinned iron or other sheet metal varnished or japanned. This
frame covers in the sides of the dish and its upper face is cut out at the centre so
as to leave a projecting flange all round which lies horizontally at a slight distance
above the upper edge of the walls of the inner glass dish so as to leave a space for
a sliding cover of non-actinic glass which may be slid into a slot in the frame
left therefor and so cover the whole dish while its edges are guarded by the frame.
The central hole in the upper face of the frame is provided with a hinged cover for
closing it and the said frame has also a hinged cover which may be used to close the
lip aforesaid. The frame does not extend far under the bottom of the glass dish
but leaves a free space thereunder so that the plate or film or other object in the
dish may be viewed by either reflected or transmitted light when under the process
of development or other treatment.
The accompanying drawing illustrates a dish of the nature above described Fig. 1
being a plan view thereof Fig. 2 a side elevation Fig. 3 an end elevation Fig. 4 a
section on line 4 4 Fig. 1 Fig. 5 a section on line 5 5 Figs. 2 and 3.
A is the inner dish having the bottom a and the four side walls b b b b.
c is the
lip made thereon and d the screen in front of the lip. e e are plates or raised pieces
on the floor of the dish as is usual in photographic dishes. B is the sliding cover of
non actinic glass. C is the surrounding frame having the under flange c¹ the upper

page_text: flange cand the two hinged doors c² and c³. c is a finger hole for convenience in
drawing out the slide B.
I do not confine myself to the exact shape of the dish nor to the position of the
lip as shown nor of the screen, but such position of lip and screen are recommended
for facility of cleaning.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is ;-
A dish or case for the purpose set forth comprising an inner dish of non corrodible
material having a bottom a, sides b, a lip c and a screen d, an outer casing C open
above and below, a sliding cover B of non actinic glass and hinged doors or lids c² c³
substantially as set forth.
1
T
R. HADDAN,
Herbert Haddan & Co.,
18, Buckingham Street, Strand, London, Agent for Applicant.