IMPROVEMENTS IN SECONDARY VOLTAIC BATTERIES
Year: 1882

page_text: LETTERS PATENT to Frederick William Durham of New Barnet in the
County of Herts and Paul Ward of Fulham in the County of Middlesex for
an Invention of IMPROVEMENTS IN SECONDARY VOLTAIC BATTERIES
PROVISIONAL SPECIFICATION left by the said Frederick William Durham
and Paul Ward at the Office of the Commissioners of Patents on the 12th
July 1882.
FREDERICK WILLIAM DURHAM of New Barnet in the County of Herts and
PAUL WARD of Fulham in the County of Middlesex "IMPROVEMENTS IN
SECONDARY VOLTAIC BATTERIES”
In constructing secondary voltaic batteries it is of great advantage to make the
lead or other inetal employed present a very large surface in proportion to its
weight, and many different forms have been proposed for this purpose. Thus it
has been proposed to make the metal in the forms of thin sheets, strips, wires,
woven fabrics or pellets and to indent, perforate, corrugate or otherwise roughen
the surfaces of the pieces employed.
According to our invention we form what may be called a plate of a secondary
voltaic battery in the following manner.
We draw the lead or other metal into
the form of pinion wire that is to say wire such as is used for the pinions of clocks
or watches. We then on a rectangular frame which may be of the same metal
wind this wire lengthwise or cross wise or both so as to form a kind of compound
web every strand of which presents a surface of great extent in proportion to its
weight.
.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Frederick William Durham and Paul Ward in the Great Seal
Patent Office on the 12th January 1883.
FREDERICK WILLIAM DURHAM of New Barnet in the County of Herts and
PAUL WARD of Fulham in the County of Middlesex "IMPROVEMENTS IN
SECONDARY VOLTAIC BATTERIES"
"
In constructing secondary voltaic batteries it is of great advantage to make the
lead or other metal employed present a very large surface in proportion to its
weight, and many different forms have been proposed for this purpose. Thus it
has been proposed to make the metal in the forms of thin sheets, strips, wires,
woven fabrics or pellets and to indent, perforate, corrugate or otherwise roughen
the surfaces of the pieces employed.
According to our invention we form what may be called a plate of a secondary
voltaic battery in the following manner. We draw the lead or other metal into
the form of pinion wire, that is to say wire such as is used for the pinions of clocks
or watches. We then on a rectangular frame which may be of the same metal
wind this wire lengthwise or crosswise or both so as to form a kind of compound
web, every strand of which presents a surface of great extent in proportion to its
weight.
As it is often convenient to have the plates circular in form so that they can be
accommodated in cylindrical jars or vessels, we find it of advantage in such cases
to wind the pinion wire as a volute like a watch spring so as to form a plate of
disc shape. A number of these discs can be superposed in a glass or earthenware
jar as shewn in the accompanying section, with porous fabric between them, or
fragments or beads of glass or other non-conducting material separating the discs.
In the Figure, A are the discs of pinion wire wound in volutes, placed one above
the other within a jar B, with glass beads or marbles C interposed between the
successive discs. The wires of the 1st, 3rd, 5th &c are led up to the one electrode +
and those of the 2nd, 4th; 6th &c to the electrode. It is convenient to pass
through the centres of the discs a rod D of ebonite or other non conducting
material having a collar at its lower end, so that all the discs can, by it, be lifted
out of the jar.
-
Having thus described the nature of our invention and in what manner the
same is to be performed, we claim:
Constructing a plate of a secondary voltaic battery of lead or other suitable
metal drawn in the form of pinion wire which is wound so as to form the plate,
substantially as and for the purpose herein set forth.
In Witness whereof I the said Frederick William Durham have hereunto
set my hand and seal this tenth day of January in the year of our Lord
One thousand eight hundred and eighty three.
Kתחסם
DI