Transcriber's Note:
Every effort has been made to replicate this text as faithfully as possible, including obsolete and variant spellings and other inconsistencies. Obvious spelling/typographical and punctuation errors have been corrected after careful comparison with other occurrences within the text and consultation of external sources. Minor punctuation and printing errors have been amended without note.
The first page of the original book is an advertisement. The page was moved to the end of the text.
Two occurrences of 'Colorimeter' for 'Calorimeter' repaired.
Some hyphenation inconsistencies in the text were retained:
16-candle-power and 16-candlepower,
Electromotive and electro-motive,
Electro-meter and Electrometer,
Horseshoe and horse-shoe,
Switchboard and switch-board.