It is free from technical language and rhetorical frills, but it tells how things work, and why they work.
It is brimful of illustrations—the best that can be had—illustrations that are taken directly from apparatus and machinery, and that show what they are intended to show.
This book does not contain experiments, or tell how to make apparatus; our other books do that. After explaining the simple principles of electricity, it shows how these principles are used and combined to make electricity do every-day work.
Everyone Should Know About Electricity.
A VERY APPROPRIATE PRESENT
Third Edition
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How Two Boys Made Their Own
Electrical Apparatus.
Containing complete directions for making all kinds of simple electrical apparatus for the study of elementary electricity. By Professor Thomas M. St. John, New York City.
The book measures 5 × 7½ in., and is beautifully bound in cloth. It contains 141 pages and 125 illustrations. Complete directions are given for making 152 different pieces of Apparatus for the practical use of students, teachers, and others who wish to experiment.
PRICE, POST-PAID, $1.00.