| 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] |