Chapter VIII.—*HOW TO CONNECT AND OPERATE THE APPARATUS*. How to connect

and operate a complete wireless station; How to operate; the code, etc.

*The Operation of Wireless Telegraph Apparatus*

Do your Wireless friends come to you for advice on constructing and operating their apparatus or do you go to them for information?

Here is a chance for YOU to become the authority.

*This book is a necessity to every Progressive Experimenter.*

*It shows how to obtain the very highest efficiency from any station, and how to comply with the law. How to tune, adjust your detector, spark gap, phones, etc.*

Price, 25 Cents, Postpaid.

This book was written for the wireless experimenter who has passed the amateur stage, but explains how the beginner also can obtain the very best results from his station. It contains much useful information to this end and many "kinks".

*IT SHOWS HOW* to receive or send on long or short wave lengths with highest efficiency, to tune for longest distance reception of messages, to use the buzzer test, how to test and connect condensers, receivers, etc., how to use receiving transformers, variometers, etc., all with highest efficiency in view.

*IT ALSO DESCRIBES* the construction and use of a simple, inexpensive wave meter to tune the station to any desired wave length, and tells how to obtain a sharp wave and a pure wave.

*EXTRACTS FROM THE LAW* are also given in such a manner that they are easily understood.

If you want to get the best results from your station this is your opportunity.

*Three New Books on Home Made*

*Electrical Apparatus*

or rather, three parts of one book, each 25 cents per copy, are now in preparation and should be ready in June, 1917.

They will cover every kind of electrical apparatus, including primary and storage batteries, dynamos and motors, induction coils, rectifiers, transformers, telegraphs and telephones, etc.—all of which have actually been built.

The three parts will also be furnished as a single volume in cloth covers at $1.00 per copy, postpaid.

If interested, simply send us a postal and when the books are ready we will send you full descriptions.

*COLE & MORGAN*

Publishers of the Arts and Sciences Series

P. O. Box 1473 NEW YORK, N. Y.