Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 335
ircuit breakers short-circuited, the vibrating bell serving asinterrupter for the whole series. Obvi-ously this system requires a higher volt- U B s u HI Fig. lo. age than parallel connection, and thecells must be of sufficient E.M.F. toring the bells satisfactorily. Severalbells may be connected… … 281 10 ELECTRIC BELL WIRING several floors, or the bell in the office of a hotel may be rung fromany one of several different rooms. In this case it is necessary tohave some device to indicate from which push the bell was rung.The annunciator furnishes this information very well. A three-station…
Architecture · Building · Carpentry
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