Improvements relating to the Packing and Dispensing of Minute Quantities of Photographic Chemicals.
Year: 1899

page_text: Date of Application 13th June 1800
Complete Specification Left, 24th Jan., 1900-Accepted, 17th Mar., 1900
Complete Specification Left, 24th Jan., 1900-Accepted, 17th Mar., 1900
Improvements relating to the Packing and Dispensing of Minute
Quantities of Photographic Chemicals.
We, JOHN J. GRIFFIN & SONS, LIMITED, Manufacturers, and FRANK HEATON
IBBETSON, Photographic Manager, both of 20 and 26, Sardinia Street, Lincoln's
Inn Fields, in the County of London, do hereby declare the nature of this inven-
tion to be as follows:-
This invention relates to the method of storing or packing or dispensing
measured quantities of chloride of gold in the shape of crystals or powder as a
toning substance for photographic purposes, but is applicable also to other
photographic chemicals used in minute quantities.
The quantity of gold chloride necessary for a toning bath is so small, that the
correct measurement by means of the appliances at the disposal of an ordinary
photographer presents some difficulty.
In order to avoid this defect, we dilute the toning substance with a suitable
quantity of chlorate of potash or other innocuous substance, the two ingredients
being uniformly incorporated with each other, so that a given quantity of the
mixture contains a constant quantity of the chloride, but on account of its greater
volume is much easier to measure, than the pure chloride.
We also provide small glass tubes large enough to hold the quantity of toning
mixture and of alkali necessary for a toning bath, the alkali being placed at
the bottom of the tube and covered with a thin disc of cork and waxed to prevent
the admixture of gold with the alkali, after which the necessary quantity of
chloride mixture is introduced into the tube, also covered with a thin disc of cork,
and finally the tube is sealed hermetically by dipping its extremity in melted wax
or other suitable liquid.
Or we employ a glass tube which is open at both ends and provided with a
partition in the centre, or two tubes joined together end to end, so as to form two
compartments, one for the alkali and the other for the chloride of gold, the ends
of the tube being then corked and waxed in the manner described above.
Dated this 13th day of June 1899.
FAIRFAX & WETTER,
Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements relating to the Packing and Dispensing of Minute
Quantities of Photographic Chemicals.
We, JOHN J. GRIFFIN & SONS, LIMITED, Manufacturers, and FRANK HEATON
IBBETSON, Photographic Manager, both of 20 to 26, Sardinia Street, Lincoln's
D
071

page_text: Inn Fields, in the County of London, do hereby declare the nature of this inven-
tion 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 method of storing or packing and dispensing
measured quantities of chloride of gold in the shape of crystals or powder as a
toning substance for photographic purposes, but is applicable also to other
photographic chemicals used in minute quantities.
The quantity of gold chloride necessary for a toning bath is so small, that the
correct measurement by means of the ordinary appliances at the disposal of a
retail dealer or photographer presents some difficulty.
In order to avoid this defect, we dilute a conveniently large quantity of the
toning substance, preferably a multiple of that required for a toning bath, with
a suitable quantity of chlorate of potash or other innocuous substance, the two
ingredients being uniformly incorporated with each other, so that a given
quantity of the mixture contains a known and constant quantity of the toning
substance, which mixture is then measured off and packed in doses suitable for
a toning bath.
We also provide a special glass tube large enough to hold the quantity of
photographic chemicals or mixtures necessary for a toning or a developing bath,
the said tube being open at both ends and provided with a transverse partition
between the same, or two tubes being joined and fixed together end to end, so
as to form two compartments for the chemicals or powders which are to be used
for a developing or toning bath or other photographic bath, for instance, one
compartment for chloride of gold and the other for alkali. Each compartment,
after having been charged with the required quantity of chemical or mixture,
is closed with a cork and hermetically sealed with wax, or by other suitable
means. In this manner the two chemicals are kept separate, and prevented from
decomposition until required for use.
In the accompanying drawing A represents a glass tube embodying our inven-
tion. The tube has a glass partition a made integral with the tube, so as to
divide it into two compartments B and C, which are filled with the required
chemicals or mixtures and then closed with stoppers D and E.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, we declare that what
we claim is:-
1. The method of dispensing minute quantities of photographic chemicals in
the shape of crystals or powder, which consists in mixing a conveniently large
quantity with an innocuous substance, and then measuring off and packing the
mixture in doses corresponding to the quantity required for a bath, substantially
as described.
2. The use of chlorate of potash as a diluent or vehicle for minute quantities
of chloride of gold.
3. A glass tube open at both ends and provided with a transverse partition
dividing the tube into two compartments, substantially as and for the purpose
described.
1
FAIRFAX & WETTER,
Agents, 37 and 39, Essex Street, Strand, London.