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PREFACE.

ELECTRIC BELLS.

CHAPTER I.

PRELIMINARY CONSIDERATIONS.

CHAPTER II.

ON THE CHOICE OF BATTERIES FOR ELECTRIC BELL WORK.

CHAPTER III. ON ELECTRIC BELLS AND OTHER SIGNALLING APPLIANCES.

CHAPTER IV. ON CONTACTS, PUSHES, SWITCHES, KEYS, ALARMS, AND RELAYS.

CHAPTER V. ON WIRING, CONNECTING UP, AND LOCALISING FAULTS.

ADDENDUM. The Gassner Battery.

INDEX.

WHITTAKER'S LIBRARY OF ARTS, SCIENCES, MANUFACTURES AND INDUSTRIES.