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

Fig. 25

The bell should now ring properly when the push is pressed.

To sum up, one wire leads from one spring of the push to the bell, one wire from the other spring of the push to the battery, and another wire from the remaining binding post on the bell to the remaining binding post on the battery. It is immaterial whether the zinc terminal or the carbon terminal go to the bell or push.

Combinations of Bells and Pushes.

One of the wires in a bell circuit may be replaced by the ground ([Fig. 26]). Connection may be made to a gas or water pipe or to a metal plate buried deep in damp earth. Any wire fastened to such a plate must be thoroughly soldered to it or a voltaic action will be set up, which will eat it away at the point of contact.

Fig. 26

When one bell is to be rung from two or more points the pushes are to be connected in multiple ([Fig. 27]) as if they were in series; all would have to be closed to complete the circuit.

Fig. 27