An Improved Fluid for Primary Batteries.
Year: 1890

page_text: Date of Application, 25th Jan., 1890
Complete Specification Left, 28th Apr., 1890-Accepted, 21st June, 1890
PROVISIONAL SPECIFICATION.
An Improved Fluid for Primary Batteries.
I THEOPHILUS COAD, of 31 Soho Square, London W.C. Electrician, do hereby
declare the nature of this invention to be as follows:-
In ten ounces of nitric acid is dissolved four ounces of mercury, then add one
ounce of carbonate of potash, then one ounce of carbonate of soda, then four ounces
of bichromate of potash, then fifty ounces of water, then twenty ounces of sulphuric
acid, and then twelve ounces of common soda. When the above has become cold, to
every forty ounces of the fluid, add, twenty more ounces of water, six ounces of nitric
acid, and four ounces of common soda.
Dated this 95th dow of Innun1900
COMPLETE SPECIFICATION.
An Improved Fluid for Primary Batteries.
I THEOPHILUS COAD, of 31 Soho Square, London, W.C. Electrician, 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 :-
A fluid according to this invention is primarily intended for use in single fluid
batteries, using zinc and carbon electrodes, and is made from the following ingredients:
Nitric acid-commercial strength-mercury, carbonate of potash, carbonate of soda,
bichromate of potash, sulphuric acid-commercial strength-common soda and water.
When the fluid is required to give a high power, but not of long working duration, it
is composed of nitric acid, mercury, bichromate of potash and water, mixed as and in
about the following proportions: First four ounces of mercury dissolved in ten
ounces of nitric acid, to this is added four ounces of bichromate of potash and fifty
ounces of water. When the fluid is required to give less violent power, but longer
working duration, the whole of the before mentioned ingredients are used as follows
First four ounces of mercury is dissolved in ten ounces of nitric acid to which is
added preferably in the following order; one ounce of carbonate of potash, one ounce
of carbonate of soda, four ounces of bichromate of potash, fifty ounces of water,
twenty ounces of sulphuric acid, and twelve ounces of common soda. When this
mixture has become cold, to every forty ounces add, twenty ounces of water, six ounces
of nitric acid, and four ounces of common soda. After standing a few hours the fluid
is ready for use.
:
Having now particularly described and ascertained the nature of this Inven-
tion, and in what manner the same is to be performed; I declare that what I
claim is :-
1-In a fluid for primary batteries the use of a combination of nitric acid, mercury
and bichromate of potash, as and in, or about, the proportions stated in the foregoing
specification.
2-A fluid for primary batteries composed of nitric acid, mercury, carbonate of
potash, carbonate of soda, bichromate of potash, sulphuric acid, common soda and
water, mixed as and in about the proportions stated in the foregoing specification.
3-In the preparation of a fluid for primary batteries mainly composed of nitric
acid, mercury, carbonate of potash, carbonate of soda, bichromate of potash, sulphuric
acid, common soda, and water, adding to a mixture as described, of the above named

page_text: chemicals when cold, water, nitric acid, and common soda, as and in about the
proportions stated in the foregoing specification.
4-In fluids for primary batteries, the use with other ingredients, of a combination
of nitric acid, mercury, bichromate of potash, and water, in or about the proportions
stated.
5-In fluids for primary batteries, the use of nitric and sulphuric acids and an
alkali or alkalies, in proportions substantially as described.
Dated this 20th 1
CA 1000
FREDERIC PRINCE,
1, Quality Court, Chancery Lane, W.C., Agent for Applicant.