Battery, Peroxide of Lead.
A battery in which peroxide of lead (lead binoxide) is the depolarizer.
It is a sort of predecessor of the present secondary battery.
Battery, Platinized Carbon.
A modification of Smee's battery, in which platinized carbon is used for
the negative plates. Before polarization the E. M. F. is equal to that
of Smee's battery. Polarization reduces its electro-motive force
one-half.
Battery, Plunge.
A battery whose plates are mounted so as to be immersed in the battery
cups or cells, when the battery is to be used, and withdrawn and
supported out of the cups when not in use. The object is to prevent
wasting of the plates by standing in the solution. It is a construction
generally used with sulphuric acid--chromic acid solution and
amalgamated zinc and carbon plates.
Battery, Pneumatic.
A battery arranged to have air blown through the solution to assist
diffusion and depolarization. It is a construction applied to chromic
acid or bichromate batteries.
Battery, Primary.
A battery in which the current is supplied by the solution of one of the
plates by the solution. The term distinguishes it from a secondary or
storage battery.
Battery, Pulvermacher's Electro-Medical.
In this battery, the electrodes were zinc and copper wires wound upon
small pieces of wood. Dilute vinegar was used as the excitant, because
it could be found in every household. Formerly the battery had great
success. It is now little used.
Battery, Sal Ammoniac.
Batteries in which a solution of ammonium chloride is the excitant; they
are very extensively used on open circuit work. (See Battery,
Leclanché.)
The crystals formed in these batteries have been analyzed and found to
consist of ammonium zinc chloride, 3 Zn Cl2, 8 N H3, 4 H20.
Battery, Salt, or Sea Salt.
Batteries in which a solution of sodium chloride or common salt is the
excitant, have been largely used, especially for telegraphic purposes.
The Swiss telegraphs use a carbon-zinc combination with salt and water
as the excitant. The batteries are sometimes mounted as plunge
batteries. They are exhausted by short circuiting after some hours, but
recuperate on standing. The zinc is not amalgamated.