Part 18 (2/2)

_Everyone Should Know About Electricity._

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,” ”Fun with Electricity,” ”The Study of Elementary Electricity and Magnetism by Experiment,” ”The Study of Electric Motors by Experiment,” ”Electrical Handicraft,” Etc., Etc.

126 Pages--109 Ill.u.s.trations and Diagrams Bound in Cloth--Net $1.00

This book contains much practical and some theoretical information regarding the operation and explanation of wireless outfits. It discusses enough of the theoretical side to make the student sure of himself and to give a well-rounded knowledge of this most practical subject.

The author has explained the various pieces of apparatus needed in a wireless station in such a clear manner that the student can not fail to understand how they work and why they work. The numerous drawings and diagrams simplify the discussions to such an extent that the reader will not want to skip a single paragraph.

”Things a Boy Should Know About Wireless” will be welcomed by thousands of enthusiasts and it should find its way into every library.

From

THOMAS M. ST. JOHN

Cascade Ranch.

East Windham,--N.Y.

The Study of Elementary Electricity and Magnetism by Experiment

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

FOURTH EDITION Price, postpaid, $1.25.

The book contains 220 pages and 168 ill.u.s.trations. It measures 5 7-1/2 in., and it is bound in green cloth.

CONTENTS: Part I. Magnetism.--Chapter I. Iron and Steel.--II.

Magnets.--III. Induced Magnetism.--IV. The Magnetic Field.--V.

Terrestrial Magnetism. Part II. Static Electricity.--VI.

Electrification.--VII. Insulators and Conductors--VIII. Charging and Discharging Conductors.--IX. Induced Electrification.--X.

Condensation of Electrification.--XI. Electroscopes.--XII.

Miscellaneous Experiments.--XIII. Atmospheric Electricity. Part III. Current Electricity.--XIV. Construction and Use of Apparatus.--XV. Galvanic Cells and Batteries.--XVI. The Electric Circuit.--XVII. Electromotive Force.--XVIII. Electrical Resistance.--XIX. Measurement of Resistance.--XX. Current Strength.--XXI. Chemical Effects of the Electric Current.--XXII.

Electromagnetism.--XXIII. Electromagnets.--XXIV. Thermo electricity.--XXV. Induced Currents.--XXVI. The Production of Motion by Currents.--XXVII. Applications of Electricity.--XXVIII.

Wire Tables.--Apparatus List.--Index.

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