An Improved Battery Cell with Double Case applicable also as a Leyden Jar.
Year: 1899

page_text: Date of Application, 26th Aug., 1899-Accepted, 9th Dec., 1899
COMPLETE SPECIFICATION.
An Improved Battery Cell with Double Case applicable also as a
Leyden Jar.
I, CESAR VOGT, of 17, Alvenslebenstrasse, 17, Berlin, in the Empire of
Germany, 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:-
This invention refers to the construction of a completely insulated battery
which is specially designed for safe transport, being almost insensible to shocks
or falls.
Outside the ordinary jar, I place a second case or box of similar shape suffi-
ciently large to leave a space between, in which is placed a suitable non-
conducting packing, with in some cases occasional intermediate blank spaces
or suitable bodies.
It is desirable that neither the packing, the intermediate spaces or bodies,
nor the external case should be good conductors of electricity. In special
cases such as that of the dry battery or Leyden jar, the contrary may be the
rule and the external case may be formed of a material which is a good con-
ductor. In the case of cells which have to sustain severe shocks, the packing
may be employed without the intermediate spaces. Cells thus constructed,
will be found to resist pressure, vibration and blows or falls, and to avoid the
loss of current caused by defective insulation.
By preference, I employ for packing between the walls a substance known
as colophony, which possesses in a high degree the properties necessary for this
purpose.
I will now describe my invention with reference to the accompanying draw-
ings, in which,
Fig. 1 represents a vertical section of a pot with external casing formed
according to my invention.
Fig. 2 shews a horizontal section of the same.
a represents an ordinary dry battery with terminals b, c. d is an external
casing formed in one or several pieces. When the invention is to be used
as an ordinary dry battery. it will be formed of a substance which is a bad
conductor of electricity. When, however, the invention is to he used as a
Leyden iar, it is desirable to form the external casing d of a substance which
is a good conductor of electricity. e, e are intermediate substances or spaces
which serve to maintain a certain distance between a and e f is a quantity
of packing.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
1. A dry battery surrounded by a second external casing of any suitable
substance, the space between the walls being filled with a suitable insulating
Lanth

page_text: 2. A dry battery as claimed in Claim 1, characterised by the arrangement of
an external casing d and the insulating packing f, and with or without inter-
mediate bodies or substances e, as herein described and set forth.
3. A dry battery as described in Claims 1 and 2 distinguished by the external
casing d being made of a conducting substance with the object of employing
the said battery as a Leyden jar, as herein described and set forth.
Dated this 26th day of August 1899.
S. S. BROMHEAD,
Agent for Applicant, 33, Cannon Street, E.C.