Battery, Wollaston.
The original plunge battery is attributed to Wollaston. He also invented
the battery known by his name, having the disposition shown in the cut,
of zinc Z, surrounded by a thin sheet of copper C; o, o', o", are the
terminals and B, B, the battery jars. Dilute sulphuric acid is used for
exciting fluid.
B. A. U.
Abbreviation for British Association unit, referring generally to the B.
A. unit of resistance.
B. A. Unit of Resistance.
The original ohm used under that name previous to 1884. The Paris
committee of that year recommended as a practical unit what is known as
the legal ohm. (See Ohm, Legal.)
1 Legal Ohm = 1.0112 B. A. Units of Resistance.
1 B. A. Unit of Resistance = .9889 Legal Ohms.
1 B. A. Unit of Resistance = .98651E9 C. G. S. units.
B. E. adj.
British Engineering, a qualification of a set of units, the B. E. units,
having for base the foot and pound. The term is but little used.
Beaumé Hydrometer.
A hydrometer graduated on the following principle:
The zero point corresponds to the specific gravity of water for liquids
heavier than water. A solution of 15 parts of salt in 85 parts of water
corresponds in specific gravity to 15° B., and between that and zero
fifteen equal degrees are laid out. The degrees are carried down below
this point.
The zero points for liquids lighter than water correspond to the
specific gravity of a solution of 10 parts of salt in 90 parts of water.
The specific gravity of water is taken as 10° B. This gives ten degrees
which are continued up the scale.
Becquerel's Laws of Thermoelectricity.
These are stated under the heads, Law of Intermediate Metals and Law of
Successive Temperatures, q. v.
Bed Piece.
In a dynamo or motor the frame carrying it, including often the
standards in which the armature shaft is journaled, and often the yoke
or even entire field magnet core.
Bell, Automatic Electric.
A bell which rings as long as the circuit is closed, having a circuit
breaker operated by its own motion. (See Bell, Electric.)
Synonyms--Trembling Bell--Vibrating Bell.
Bell, Call.
A bell operated by electricity, designed to call attention, as to a
telephone or telegraphic receiver. (See Bell, Electric.)