" "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 Illustrations 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 illustrations. It measures
5 x 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.

This is a text-book for amateurs, students, and others who want to take
up a systematic course of electrical