| chap. | page | | I. | Preliminary Considerations | 1 | | II. | On the Choice of Batteries for Electric Bell Work | 18 | | III. | On Electric Bells and other Signalling Appliances | 59 | | IV. | On Contacts, Pushes, Switches, Keys, Alarms, and Relays | 109 | | V. | On Wiring, Connecting up, and Localising Faults | 144 |
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