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

by Norman H. Schneider

Burglar Alarm Annunciators.

Although almost any annunciator may be used for open circuit burglar alarm work, they usually do not contain certain devices which are desirable in burglar alarm work.

In [Fig. 62] is shown a diagram of a burglar alarm annunciator, the view being schematic of the back board.

The references are as follows: A is the main alarm bell situated wherever desired and connected to the binding posts BB. The battery connection leading directly to the battery K is marked C and that leading to the contact spring is marked D. The cut-off switch E cuts off the battery while F is the constant ring switch. G is the upper bar and H the lower bar, while the letters JJ denote the indicating drops. The door and window springs are lettered S. At L is a switch which may be used to disconnect the entire burglar alarm system. Where it is desired to disconnect only a section at a time, the switch corresponding to the section is turned off the upper bar G and on to the lower bar H.

Fig. 62