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

Then with a sharp knife carefully cut away a little piece of the insulation from each wire beyond the bell and battery and short circuit the bared spots with the knife blade K. Keep working towards the push. The bell will ring each time at K K until the break D is passed, at C it will not. It becomes an easy matter then to locate it.

Fig. 37

If the bell and push are far apart, as in [Fig. 37], a break between the push and the bell may be found as shown. With the knife blade K at different points the bell will ring, but after passing the break D it will not ring.

Such simple tests as are here given can be carried out by any one, but far better results will be obtained if the reason for each is first learned.

This can be readily done by a careful study of the diagrams and text.

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CHAPTER IV
Alarms

Fire Alarms.

Thermostats, heat alarms and fire alarms are all practically the same, the term thermostat being applied principally to the apparatus which closes the electrical circuit.