Tirrill regulator

Tirrill regulator

[′tir·əl ‚reg·yə‚lād·ər]
(electricity)
A device for regulating the voltage of a generator, in which the field resistance of the exciter is short-circuited temporarily when the voltage drops.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.