Battery of Dynamos. A term used in speaking of a number of dynamos coupled to supply the same circuit. They may be coupled in series or parallel.
Battery, Plunge. A battery in a cabinet or frame, so arranged that the active plates can be removed or raised out of the solutions. This is usually accomplished by having the plates attached to a movable frame which, by means of a ratchet-shaft and chains, can be raised or lowered. Its object is to prevent the corrosion of the plates when not in use.
Battery, Primary. A voltaic cell or battery generating electric energy by direct consumption of material. The ordinary voltaic cell, or galvanic battery, is a primary battery.
Battery, Secondary. A storage-battery, an accumulator.
Battery Solution. The active excitant liquid, or electrolyte, placed within a cell to corrode the positive element. Also called Electropoion.
Battery, Storage. A secondary battery; an accumulator; a battery which accumulates electricity generated by primary cells or a dynamo.
Battery-gauge. A galvanometer used for testing batteries and connections. It is usually small in size, and may be carried in a pocket.
Battery-jar. A glass, earthen, or lead vessel which contains the fluids and elements of each separate cell of a battery.
Baumé Hydrometer. (See [Hydrometer, Baumé].)
Becquerel Ray and Radiation. An invisible ray discovered by Becquerel, which is given out by some compounds and chemicals—notably uranium—and which has the power to penetrate many opaque bodies and objects impenetrable to the actinic rays of ordinary light. These rays are used chiefly in connection with the photographic dry-plate.