Seventh Edition Price, postpaid, $1.00

CONTENTS: Chapter I. About Frictional Electricity.--II. About
Magnets and Magnetism.--III. How Electricity is Generated by the
Voltaic Cell.--IV. Various Voltaic Cells.--V. About Push-Buttons,
Switches and Binding-Posts.--VI. Units and Apparatus for Electrical
Measurements.--VII. Chemical Effects of the Electric
Current.--VIII. How Electroplating and Electrotyping are Done.--IX.
The Storage Battery and How it Works.--X. How Electricity is
Generated by Heat.--XI. Magnetic Effects of the Electric
Current.--XII. How Electricity is Generated by Induction.--XIII.
How the Induction Coil Works.--XIV. The Electric Telegraph, and How
it Sends Messages.--XV. The Electric Bell and Some of its
Uses.--XVI. The Telephone, and How it Transmits Speech.--XVII. How
Electricity is Generated by Dynamos.--XVIII. How the Electric
Current is Transformed.--XIX. How Electric Currents are Distributed
for Use.--XX. How Heat is Produced by the Electric Current.--XXI.
How Light is Produced by the Incandescent Lamp.--XXII. How Light is
Produced by the Arc Lamp.--XXIII. X-Rays, and How the Bones of the
Human Body are Photographed.--XXIV. The Electric Motor and How it
Does Work.--XXV. Electric Cars, Boats and Automobiles.--XXVI. A
Word About Central Stations.--XXVII. Miscellaneous Uses of
Electricity.

This book explains, in simple, straightforward language, many things
about electricity; things in which the American boy is intensely
interested; things he wants to know; things he should know.

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.

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_Everyone Should Know About Electricity._

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A VERY APPROPRIATE PRESENT

Things a Boy Should Know About Wireless

By
THOMAS M. ST. JOHN, Met. E.

Author of "Things a Boy Should Know about Electricity,