The bus wires may be divided into positive, negative, and, in the
three-wire system, neutral bus wires.
Synonyms--Omnibus Rod, Wire, or Bar--Bus Bar, or Wire.
Buzzer.
An electric alarm or call produced by a rapid vibration of electric make
and break mechanism, which is often magnified by enclosure in a
resonating chamber, resembling a bell, but which is not struck or
touched by the vibrating parts. Sometimes a square wooden box is used as
resonator.
Fig. 72. BUZZER.