Chapter I.—THE AERIAL. Chapter II.—SPARK COILS. Chapter

III.—TRANSMITTING APPARATUS AND ITS CONSTRUCTION. Chapter IV.—THE RECEIVING APPARATUS AND ITS CONSTRUCTION. Chapter V.—ARRANGEMENT AND OPERATION OF THE APPARATUS. COMPLETE DETAILS ARE GIVEN WITH WORKING DRAWINGS.

*Sent anywhere postpaid for 30 Cents*

*The Boy Electrician*

Practical Plans for Electrical Toys and Apparatus, with an Explanation

of the Principles of Everyday Electricity.

*By ALFRED P. MORGAN.*

Author of "Wireless Telegraph Construction for Amateurs" and "Wireless

Telegraphy and Telephony," etc.

*With full-page Illustrations and 324 Working Drawings and Diagrams*

*by the author. 8vo., Cloth, Net Price, $2.25.*

This is the age of electricity. The most fascinating of all books for a boy must therefore be one dealing with the mystery of this ancient force and modern wonder, even a mere list of whose services is impossible. The best qualified of experts to instruct boys, Alfred P. Morgan, has in a book far superior to any other of its kind told not only how to make all kinds of motors, telegraphs, telephones, batteries, etc., and to do so economically, but has explained the principles upon which these depend for operation, and how the same thing is done in the every-day world be well presented and so attractive is this really great book that it will be an education for any bright boy to have it, as well as the best kind of a moral safeguard, by leaving no time or thought for evil, and a means of future benefit beyond the power of any one to reckon. Glancing over the pages of this book, one cannot but be impressed by the excellent illustrations, clearness of expression and the large number of subjects that are covered. It is beyond doubt the best book in this line that has ever been written or published. It is a book that will delight every boy who has a leaning towards electrical experiments. The author writes in a clear and chatty style and while he has a thorough technical knowledge of his subject he has succeeded in treating it in a simple manner so that it is readily intelligible to his young readers.

*Among the Chapter Headings and Contents are:*

Magnets and Magnetism—Static Electricity—Static Electric Machines—Cells and Batteries—Electro-Magnetism and Magnetic Induction—Electrical Units—Electrical Appurtenances—Electrical Measuring Instruments—Bells, Alarms and Annunciators—Electric Telegraphs—Microphones and Telephones—Induction Coils—Transformers—Wireless Telegraphy—Wireless Telephony—Electric Motors—Dynamos—An Electric Railway—Miniature Lighting—Miscellaneous Electrical Apparatus.

*READ WHAT HAS BEEN SAID OF IT.*

"Even a casual glance through the many pages of the book does not fail to emphasize the fact that Mr. Alfred P. Morgan has indeed succeeded well in giving the juvenile electricians a work that has long been sought."—Popular Electricity.

"We have no hesitation in commending the book to the attention of the juvenile audience for which it is intended."—Boston Post.

"A great book for enterprising boys. Bright boys will highly appreciate it and feel like thanking the wideawake publishers for putting such a reliable and interesting work in the field."—New Haven Journal.

"The book covers the subject of electricity thoroughly in all its phases and is a splendid acquisition to any boy’s library."—Detroit Times.

"In this age of electricity a book like the present one is both fascinating and valuable especially to boys. The book is attractive with its many illustrations and will prove of much educational value for any bright boy."—Zion’s Herald.

"This is an admirably complete and explicit handbook for young boys who fall under the spell of tinkering with electrical apparatus."—Boston Transcript.

"Well presented and attractive this book will be a source of great benefit and delight for any bright boy."—New Orleans Times-Picayune.

*Price, $2.25 Postpaid*

COUNTLESS OTHER MAGAZINES, NEWSPAPERS AND LIBRARIES HAVE

ENDORSED THIS GREAT BOOK. SEND FOR A COPY NOW.

*If you are interested in this great book, write for our 8-page special*

*descriptive circular.*

Wireless Telegraphy and Telephony Simply Explained

By ALFRED P. MORGAN.

*A NEW BOOK by the author of "Wireless Telegraph Construction for Amateurs."*

This is undoubtedly one of the most complete and comprehensive treatises on the subject ever published, and a close study of its pages will enable one to master all the details of the wireless transmission of messages. The author has tilled a long-felt want and has succeeded in furnishing a lucid, comprehensible explanation in simple language of the theory and practice of wireless telegraphy and telephony. The book treats the subject from an entirely new standpoint. Several very novel and original ideas have been carried out in its making. It is well illustrated by over one hundred and fifty interesting photographs and drawings.. All diagrams have been made’ in perspective showing the instruments as they actually appear in practice. The drawings are carefully keyed and labeled. Many of the photographs are accompanied by phantom drawings which reveal the name and purpose of each part.

It is a book which the wireless experimenter cannot afford to be without. It will prove even more valuable to the layman.

*Among the contents are: Introductory. Wireless Transmission and Reception. The Ether. Electrical Oscillations. Electro magnetic Waves. The Means for Radiating and Intercepting Electric Waves. Aerial Systems. Earth Connection. The Transmitting Apparatus. Current Supply. Spark Coils and Transformers. Condensers. Helixes. Spark Gaps. Anchor Gaps. Aerial Switches, Etc. The Receiving Apparatus. Detectors, Etc. Tuning Coils and Loose Couplers. Variable Condensers. Tuning and Coupling. Directive Wave Telegraphy. The Dignity of Wireless. Its Applications and Service. Wireless in the Army and Navy. Wireless on an Aeroplane. How a Message is Sent and Received. The Wireless Telephone. The Ear. How We Hear. Sound and Sound Waves. The Vocal Cords. The Structure of Speech. The Telephone Transmitter and Receiver. The Photophone. The Thermophone. The Selenium Cell.*

*Handsomely Bound in Cloth with Embossed Cover. (Postpaid, $1.00)*

Build Your Own Wireless Instruments

Complete Up-to-the-Minute Authentic Practical

WIRELESS TELEGRAPH CONSTRUCTION FOR AMATEURS

By ALFRED POWELL MORGAN

3d EDITION

220 Pages 163 Illustrations

*Price, $1.50, Postpaid*

*Handsomely Bound in Silk Cloth*

Thoroughly up to date and unusually complete. Given in minute detail, full directions for constructing wireless apparatus and various outfits capable of receiving from 100 to 1,500 miles and transmitting 3 to 100 miles. Also clearly explains the purpose and action of each instrument.

Directions for Operating and Adjusting, etc.

*A SPLENDID TREATISE OF WIRELESS ALONG CONSTRUCTIVE LINES*

_Price,_ $1.50, _Postpaid_

The value of this book has been greatly increased by the addition of much new subject matter and many illustrations of recent interest.

The new text explains fully how to build the most recent forms of Quenched Gaps, Rotary Gaps, Dough-Nut Tuners, Kick-back Preventers, Audion Detectors and numerous other instruments, accompanied by dimensioned working drawings Several very interesting and instructive photographs have been included.

*I.—Introduction. II. The Apparatus. III.—Aerials and Earth Connections. IV.—Induction Coils. V.—Interrupters. VI.—Transformers. VII.—Oscillation Condensers and Leyden Jars. VIII.—Spark Gaps or Oscillators. IX.—Transmitting Helixes X.—Keys. XI.—Aerial Switches and Anchor Gaps. XII.—Hot Wire Ammeter. XIII.—Oscillation Detectors. XIV.—Tuning Coils and Tuning Transformers. XV.—Receiving Condensers. XVI.—Telephone Receivers and Headbands. XVII.—Operation. XVIII.—The Amateur and the Wireless Law. How to Secure a License. Oscillation Helix. Quenched Spark Gap. Rotary Gaps. Kick-Back. The Variometer. New Crystal Detectors. The Audion.—Appendix.*

*ENDORSED BY WIRELESS CLUBS THROUGHOUT THE COUNTRY AS BEING THE MOST PRACTICAL BOOK PUBLISHED ON WIRELESS.*

*IF YOU ARE INTERESTED IN WIRELESS YOU NEED THIS BOOK*

*LESSONS IN WIRELESS TELEGRAPHY*

(WRITTEN SO THAT YOU CAN UNDERSTAND THEM)

Our new book contains a systematic elementary course in the principles of Wireless Telegraphy and the electrical laws upon which it depends. It contains more reliable and practical information than any other book of its kind.

*IF YOU OWN A WIRELESS OUTFIT* it will give you a thorough grounding in the principles and care of the efficiency of your apparatus.

*IF YOU INTEND PURCHASING OR OPERATING WIRELESS TELEGRAPH APPARATUS* you could not desire a more complete or concise explanation of matters it is essential to understand.

*IF YOU ARE A LAYMAN* the book will prove valuable and interesting. It is something that you can well afford to read for it will give you a clear conception of one of the greatest wonders of the age.

*Price, 30 Cents, Postpaid.*

The book is divided into thirty lessons, each lesson dealing with a separate subject and following in a logical order so that repetition and possibility of confusion are completely avoided. It is profusely illustrated with perspective drawings and diagrams, each being carefully keyed so that parts may be readily discerned.

It not alone describes the actual workings and construction of the instruments that go to make up a wireless station in sufficient detail to prove of great value to the experienced student but treats the subject in such a manner that even the beginner will have no trouble to clearly grasp the matter.

Among the lists of contents may be mentioned a careful discussion and explanation of such subjects as the "why and the wherefore" of Magnetism, Magnetic Induction, Primary Cells, Storage Batteries, the Dynamo, the Alternator, the Motor Generator, the Induction Coil, the Transformer, the Condenser, Volts, Amperes, Watts, Coulombs, Ohm’s Law, Electric Waves, the Ether, Oscillations, the Aerial, Spark Gaps, Quenched Gaps, Rotary Gaps, Helixes, Coupling, Tuning, Detectors, Tuning Coils, Loose Couplers, Variometers, Condensers, Hot Wire Ammeters, Circuits and Diagrams, etc., etc., etc.

Each subject is discussed in detail and in all its branches. For instance, the lesson dealing with aerials describes vertical aerials, pyramid aerials, flat top aerials, umbrella aerials, loop aerials, etc., and peculiarities or advantages. The lesson on detectors deals with Electrolytic, Perikon, Silicon, Pyron, Carborundum, Magnetic and Audion Detectors, etc. The lesson on the theory and arrangement of circuits will be found invaluable.

*THIS IS THE BOOK THAT YOU HAVE BEEN LOOKING FOR.*

Home Made Electrical Apparatus

Three of the most popular books ever published, filled with just the sort of information you have been looking for. Each volume is printed on heavy paper and contains 72 pages and over 60 illustrations and working drawings for making every sort of electrical apparatus, all of which has actually been built by the author.

Written so that you can completely understand them.