Rectifiers Replace Power Chargers
A change has been made in the fire and police alarm systems of Indianapolis, Ind., which has greatly increased its efficiency.
Thirty new General Electric copper oxide rectifiers have been installed at fire alarm headquarters. The copper oxide rectifiers are supplied with 3-phase alternating current, each phase operating ten rectifiers. The three bulbs mounted at the top of the panel board are connected, one to each phase. In the event of one, two or three phases failing, the light or lights will go out.
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