Year: 1888

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FREDERICK LAWRENCE RAWSON of 11 Queen Victoria Street London E.C.
Electrical Engineer, and WILLIAM WHITE of 40 Ranelagh Road Willesden Junction
Electrical Engineer do hereby declare the nature of this invention to be as follows:-
Our invention consists in improvements in electrical batteries and methods of
closing the same whereby the escape of liquid used therein is prevented and the gas
formed therein is allowed to escape.
In the outer casing of the cell we let in a stopper preferably made of a hard
material which is not attacked by the acid of the battery. This stopper is made so
as to act as a stuffing box having a receptacle at the top to contain material such as
glass or slag wool, cocoa nut fibre or some such substance which is not attacked by
the acid.
A plug is arranged so as to screw down upon the glass, wool or other material so as
to compress it to any degree of hardness.
The gas evolved passes easily through the material passing first through a small
hole or holes bored in the stopper whilst the liquid can only pass slowly through the
material.
•
The stopper may be made in two parts the lower having a large hole or holes for
filling and emptying liquid, the stopper as above described being screwed or fastened
tightly into it.
We form our cover for the top of the cell as follows:-A piece of chonite or
other suitable material of suitable thickness is cut to the size of the cell, and
provided with a thin rim which protrudes below the top of the cell.
This rim is
fastened to the edge of the cell by a suitable cement. The top of the cell is previously
flattened and its edges made true and smooth. Three holes are bored in the top
plate, and in the centre is fastened the stopper above described, and through the other
two pass the lugs from the plates of the battery. These lugs may be made of any
If the
suitable hard alloy, and to them are soldered the terminals of the battery.

page_text: cell contain two or more divisions, strips of india rubber sheet should be fastened on
the under side of the cover so as to press against the partitions and prevent leakage
from one division to the other. The cover may then be easily fastened down from
the outside by any suitable cement, such as Marine glue.
Dated this 24th day of March 1888
COMPLETE SPECIFICATION.
Improvements in Electrical Batteries and Methods of Closing
the same.
We FREDERICK LAWRENCE RAWSON of 11 Queen Victoria Street London, E.C.
Electrical Engineer, and WILLIAM WHITE of 40 Ranelagh Road, Willesden Junction
Electrical Engineer, 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 :—
Our Invention consists of improvements in electrical batteries and methods of
closing the same whereby the escape of liquid used therein is prevented and the gas
formed therein is allowed to escape.
Referring to the drawings in the outer case of the cell (figs. I and 11) we let in
a stopper S preferably made of ebonite or other hard material which is not attacked
by the acid of the battery. This stopper is made so as to act as a stuffing-box having
a receptacle R at the top to contain material such as glass or cocoa-nut fibre or some
such substance which is not attacked by the acid. A plug P. is arranged so as to
screw down upon the cocoa-nut fibre or other material so as to press it to any degree
of hardness. The gas evolved passes easily through the material, passing first through
a small hole or holes C bored in the bottom of the stopper and afterwards through the
small hole H in the plug P whilst the liquid can only pass slowly through the
material.
The stopper is preferably made in two parts the lower having a large hole K or
holes for filling and emptying liquid and being tightly screwed or cemented into the
cover of the cell. The upper portion is screwed into the lower by using the lower
milled edge M and contains the chamber in which the glass or cocoa-nut fibre is
placed, the screwed plug P serving to compress it to the necessary degree.
We form our cover for the top of the cell as follows:-A piece of ebonite or other
similar material of suitable thickness is cut to the size of the cell and is provided with

page_text: a rim N which protrudes below the top of the cell. This rim is fastened to the edge
of the cell by a cement such as Chatterton's compound or marine glue. The top of
the cell is previously flattened and its edges made true & smooth.
Figs. I and II show a half sectional elevation and plan respectively of a double.
cell with its cover and a stopper in each division. Holes are bored in the top plate
and in it are fastened the stoppers S above described. Through the other holes pass
the lugs L from the plates of the battery. These lugs may be made of any suitable
hard alloy and to them are soldered the terminals T of the battery. If the cell
contains two or more divisions a strip of india-rubber I should be fastened on the
under side of the cover so as to press against the partitions and prevent leakage from
one of the divisions to the other. The cover may then be easily fastened down from
the outside by a suitable cement such as Chatterton's compound or marine glue.
Fig. III represents a sectional plan of the stopper through A. B.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what
we claim is: -
1. In electrical batteries the use of a stopper substantially as described and for the
purposes set forth.
2. In electrical batteries the combination of the stopper substantially as described
with the method of forming and sealing the lid substantially as described and for the
purposes set forth.
Dated this 22nd day of December 1888