How to Install Electric Bells, Annunciators, and Alarms. / Including Batteries, Wires and Wiring, Circuits, Pushes, Bells, Burglar Alarms, High and Low Water Alarms, Fire Alarms, Thermostats, Annunciators, and the Location and Remedying of Troubles

CONTENTS

Introduction
	Page
Introduction. The principle of an electric bell.	ix
Chapter I
The Leclanche cell—Polarization—Setting tip—The dry cell—The gravity cell—Connecting up cells	1
Chapter II
The single stroke bell—The shunt bell—The differential bell—The continuous ring bell—The waterproof bell—Forms of gongs—The buzzer—Long distance bells—The relay—The push—Three point or double contact push—Floor push—Door pull—Indicating push	9
Chapter III
Bell wires—Joints—Running wires—How to put up a door bell—Combinations of bells, pushes and batteries—Faults in bells, faults in wiring—How to locate and remedy faults	23
Chapter IV
Fire alarms—Thermostats—Metallic thermostats—Mercury thermostat—How to connect thermostats—Water level indicators—Burglar alarms—Open and closed circuit alarms—Window, door and shade springs—Alarm matting—Yale lock alarm—Door trip alarm	40
Chapter V
The annunciator drop—The needle or arrow drop—The pendulum drop—Wiring up annunciators—Return or fire call systems—Double wire system—Western Electric single wire system	55
Chapter VI
Three-wire return call system—Installing elevator annunciators—Burglar alarm annunciators—Clock alarm circuit—Bells for high voltages—Bell-ringing transformers—Combination bell, door opener and telephone circuits—Fire alarm circuit—Interior fire alarm system—Fire alarm system for considerable areas	64

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