An Improvement in Apparatus for the Development of Photographic Plates or Films.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
An Improvement in Apparatus for the Development of Photographic
Plates or Films.
THEODORE BROWN, The Stereoscopic Supply Stores, Portland House, Salisbury,
Engraver, do hereby declare the nature of this invention to be as follows:-
This invention relates to apparatus, by the aid of which photographic plates or
films may be developed between two or more pieces of non-actinic glass in the
presence of daylight or any artificial illuminant. My present invention relates
particularly to apparatus which may be constructed either in watertight or
cullender form, in both cases being a chamber into which no white light may
enter. The cullender form consists of a box with drop-over or hinged lid, having
a window both in the lid and in its bottom fitted with non-actinic glass. Round
the edges and at a suitable distance from the said windows, the box is perforated,
which perforations are arched over in such a manner by another portion of the box
as to prevent any direct rays of white light entering, but at the same time giving
a free admission and exit of liquids or air. The watertight form is constructed in
a similar way, but without perforations, and with the addition of watertight joints,
and the necessary inlets, stop-taps, and air-valves for the exit or admission of
liquids or air.
Dated this 17th day of ML 1000
An Improvement in Apparatus for the Development of Photographic
Plates or Films.
THEODORE BROWN, Practical Engraver, Portland House, Fisherton, Salisbury,
I 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 apparatus by the aid of which photographic plates or
films may be developed between two or more pieces of non-actinic or colored
glass, capable of substantially reducing the power of white light.
-Referance being made to the annexed drawing. Fig. 1 shows in plan the
complete apparatus, and Fig. 2. a side section of same. The apparatus comprises
a box A, with a hinged lid C, having attached to its side a kind of anti-chamber B.
The bottom of the box is fitted with a piece of coloured or non-actinic glass A³,
TD 037

page_text: covering a suitable size opening made in the bottom and resting upon a rubber
moulding A¹, fixed to the bottom of the box.
The said colored or non-actinic glass A3, is kept in position by being tightly
pressed against the said rubber moulding A¹, by a suitable number of metal
tongues or springs A attached to the side of the box A, and thus producing water-
tight joints.
The glass in the bottom of the box A is so fitted as described, in order that it
may easily be replaced with a fresh piece, should it get broken or damaged in
any way.
The lid of the box C, is also fitted with a piece of colored or non-actinic glass C¹,
but is permanently fixed as shewn in Fig. 2.
The cover C, is perforated at two sides, at C, which perforations are arched over
at C in such a manner as to exclude direct rays of white light from the box
when it is closed.
Two projecting parts C, are fixed to the underside of the cover 'C, so that
when the box is closed the said two parts C extend toward the bottom of the box
far enough to prevent the photographic plates or films from loosely falling about
when the box is closed.
The ante-chamber B, is so constructed, that direct rays of white light may
not enter the said box A, but at the same time will permit of the entrance of
liquids.
The photographic plates or films intended for development are placed in the
box under cover from daylight, and the lid closed.
The apparatus containing the photographic plates or films is then taken out
into broad day or artificial light.
The liquids employed for the development is then poured into the ante-
chamber 13, and allowed to run down into the box A, containing the photographic
plates or films, by laying the whole apparatus flat on a table. When the operator
desires to examine the progress of the development, the plate or film is examined
by allowing the liquid to drain off into the ante-chamber, by holding the apparatus
up before a strong light. When the various stages of development have been
performed in this manner the cover is opened and the photographic plate or film
is taken out and dried in the usual manner.
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:
1. Apparatus for the development of photographic plates or films, comprising a
casing A, provided with a lid C, fitted with non-actinic glass, and having per-
forations for the entrance of liquids and exit of air, constructed in such a manner
as to prevent direct rays of white light entering the case or box, substantially
as described and shewn.
2. Metal tongues or springs A attached to a box A, in such a manner as to
permit of the ready removal or replacement of the glass A³, substantially as
described and shewn.
1
17
1000