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. Inconsistent spellings (e.g. depolariser & depolarizer) and hyphenation (e.g. guttapercha & gutta-percha) are retained as in the original text. Minor punctuation errors are corrected without comment. Changes which have been made to the text (in the case of typographical errors) are listed at the end of the book. ELECTRIC BELLS AND |