Watchmen's Time Detectors Operated by Batteries or Magneto Generators (1900)
Holtzer-Cabot Electric Company · Holtzer-Cabot Electric Company · leaf 32
UR Gravity Annunciators are simple in con-struction and positive in action. The dropis not complicated by springs, etc., as the armaturesupports the shutter arm. The checking is ac-complished by a mechanical set-back. They arespecially suitable for Railway or Steamer work.as this drop may be…
