While this book shows boys what they can do themselves, its scope has been enlarged by Mr. Baker’s chapter explaining briefly the working of electricity all about us, in light and heat, in the trolley-car, and other daily applications. In addition, Mr. Adams has prepared a Dictionary of Electrical Terms, and these brief definitions will be found peculiarly helpful in the first reading of the book.

It is believed that there is no book in this particular field comparable to Harper’s Electricity Book in its comprehensiveness, practical character, and the number and usefulness of its illustrations. It follows the successful Out-door Book for Boys in Harper’s series of Practical Books for Boys, and it will be followed by How to Understand Electrical Work, a book, not of instructions in making electrical apparatus, but of explanations of the commercial uses of electricity all about us.

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