An Improvement in Electrical Secondary Batteries.
Year: 1887

page_text: Date of Application, 10th Oct., 1887
Specification Accepted. 11th Nov., 1887
COMPLETE SPECIFICATION.
An Improvement in Electrical Secondary Batteries.
We CHARLES EMILE PONDER of Belmore Street, Enmore, Sydney in the Colony of
New South Wales, Electrician, JOHN MACGREGOR of George Street, Sydney, in the
Colony of New South Wales, Manufacturer, and PHILIP HARRIS of George Street,
Sydney, in the Colony of New South Wales, Manufacturer, 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 those kinds of electrical secondary batteries in which
electricity is stored or accumulated and which may be used for any purpose whatever
either at the time of charging or at any other time it may be desired and it has been
specially devised in order that there shall not be any waste or escape of the electricity
from the batteries no matter what the length of time is between the charging of them
with electricity and the making use of same.
Our improvement in electrical secondary batteries or accumulators consists essentially
in constructing them of cells hermetically sealed with parafin wax in order that there
shall not be any waste or escape of electricity. But in order that our invention may
be clearly understood we will now describe the same with reference to the drawings
herewith in which Figure 1 is a plan of secondary battery constructed according
thereto Figures 2 and 3 elevations Figures 4, 5 sectional elevations on lines A, B and
C, D respectively in Figure 1.
a, b are the positive and negative plates which are constructed of an alloy of lead
and antimony and preferably in the shape of a grate between the bars of which is
filled with a paste composed of oxide of lead, animal charcoal, granular lead, sulphate
of magnesia, and water which paste is afterwards compressed and dried. c is a cell
or box constructed of wood which is thoroughly boiled in parafin wax in order to
destroy its electrical conductive properties in which cell the plates a. b are placed.
Upon the top side of these plates are stems d. e. forming positive and negative poles
respectively. fg are clamping screws which are connected to the positive and negative
poles respectively by the wires h. i- is a chamber or case constructed of wood the
inside dimensions of which are sufficiently greater than the outside dimensions of the
cell c in order that when the cell ċ is placed inside the chamber or case; the intervening
spaces m² m² m³ m³ that is the top bottom sides and ends may be completely filled in with

page_text: parafin wax. k is a vulcanite tube which after the cell c has been filled with a mixture
of sulphuric acid and water and the spaces m² m² m³ m* filled with parafin wax is
withdrawn and the hole closed with parafin wax thus rendering the cell perfectly
insulated and hermetically sealed.
We do not confine ourselves to any special form of plates, cells, or chambers, nor to
the number of cells or chambers as any number of cells may be fitted or filled in one
chamber if desirable.
Having now particularly described and ascertained the nature of our said invention
and in what manner the same is to be performed we declare that what we claim is :-
The improvement in electrical secondary batteries consisting in wholly encasing
their cells in paraffin wax so as to perfectly insulate and hermetically seal them sub-
stantially as herein described and explained and as illustrated in the drawings.
Dated this 10th day of October One thousand Eight hundred and Eighty seven.
ABEL & IMRAY,
Agents for the Applicants.