Author_Institution :
American District Tel. Co., Inc., New York, N. y.
Abstract :
Protection of life and property may be secured by electrical signaling systems which have been developed to give protection against damage to property by fire, burglary, and other causes, and to supervise the activities of night watchmen and the operation of different types of mechanical equipment, and to perform other services. This paper consists of a general outline of the types of service available and the electrical systems for accomplishing them.
