mine fan signal system

mine fan signal system

[′mīn ¦fan ′sig·nəl ‚sis·təm]
(mining engineering)
A system which indicates by electric light or electric audible signal, or both, the slowing down or stopping of a mine ventilating fan.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.