A Galvanic Battery Solution.
Year: 1889

page_text: * Date of Application, 6th Aug., 1889-Accepted, 7th Sept., 1889
COME DELE DRIFICATION.
A Galvanic Battery Solution.
I, WILLIAM PRESCOTT KOOKOGEY of the City of Brooklyn in the County of Kings
and State of New York, United States of America, 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 :-
The present invention relates to galvanic battery solutions the object being to secure
a solution of chromium, sulphuric acid and water as a depolarizing battery excitant.
In a previous Patent No. 4667 dated March 29th 1887, I have claimed a battery
solution made from bichromate of potassium sulphuric acid, and water so combined,
and in such proportions that the potassium base is precipitated in the process of making
the solution in the form of acid sulphate of potash.
The object of the present invention is to secure a solution made from bichromate
of soda in a similar manner. The advantage of using bichromate of soda lies chiefly
in the fact that the sulphate of the base (sulphate of soda) is more soluble than
sulphate of potassium, and has no inclination to form chrome alum. Therefore no
great harm results, if a small proportion of the base is left in solution (except to
slightly increase the internal resistance of the battery in which it is used) which
is not the case where bichromate of potash is used, as a very small proportion of
the base held in solution is sufficient to form chrome alum to an extent very
detrimental to the working of the battery and the preservation of the elements.
For these reasons less care is necessary in making the solution from bichromate
of soda than in the case of bichromate of potassium and the temperature need not
be so high.
To make the solution under the present invention I add to two and a half pounds
of hot water three fourths of a pound of bichromate of soda of fair commercial
quality, and to the mixture add, stirring, three and one half pounds of sulphuric
acid (ayps.) about the weight of 66 Baumé, allow the solution to stand at a
temperature varying from sixty to seventy five degrees fahr. for about 24 hours
until the sulphate of soda is precipitated to the bottom of the vessel, then syphon
off, when it will be ready for use.
The proportions above stated may be slightly varied, though I recommend a
reasonably strict observance of the formula given, as experience has taught me that it
gives the best results.
Where the solution is to be used for single liquid batteries, however, the proportion
of acid and bichromate of soda may be reduced about one half, though for such
purposes I recommend making the solution under the formula first given and diluting
it after made and syphoned off.
While at first sight it would seem a chemical impossibility to precipitate the base
of bichromate of soda in the form of a sulphate, the sulphate of soda being almost as
soluble as the chromium oxide-still there is no doubt that it may be done under the
formula set forth as has been frequently proved and demonstrated by innumerable
experiments and practical workings.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what
I claim is:
:-
The herein described method of producing chromic battery solution which consists

page_text: sulphuric acid, allowing the mixture to stand until the sulphate of soda is precipitated,
and then syphoning off the liquid,-the ingredients being combined in substantially
the proportions stated.
Dated this Fifth day of August 1889.
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow, Agents.