The next cut shows the sliding form of bridge called the meter bridge,
if the slide wire is a meter long or a half- or a quarter-meter bridge,
etc., according to the length of this wire. It is described under Meter
Bridge, q. v. Many refinements in construction and in proper proportion
of resistances for given work apply to these constructions.
Synonyms--Electric Balance--Resistance Bridge--Wheatstone's Balance.
Fig. 349. METER BRIDGE.
Whirl, Electric.
(a) A conductor carrying an electric current is surrounded by circular
lines of force, which are sometimes termed an electric whirl.
(b) The Electric Flyer. (See Flyer, Electric.)
Wimshurst Electric Machine.
An influence machine for producing high potential or static electricity.
Two circular discs of thin glass are mounted on perforated hubs or
bosses of wood or ebonite. Each hub has a groove turned upon it to
receive a cord. Each disc is shellacked. They are mounted on a
horizontal steel spindle so as to face and to be within one-eighth of an
inch of each other. On the outside of each disc sixteen or eighteen
sectors of tinfoil or thin metal are cemented.