*THE MOST THOROUGH AND COMPLETE ELEMENTARY WIRELESS*

*CONSTRUCTION BOOK PUBLISHED*

The pages on the construction and installation of aerials will be found to be of considerable help to the experimenter, for it is here that the most trouble is experienced by the beginner. The practical and helpful information on this subject is alone worth several times the cost of the book.

*PARTIAL CONTENTS*

Chapter I.—*WIRELESS TELEGRAPHY*. An intensely interesting subject; amateur wireless telegraphy; the purpose of the aerial and ground; the apparatus used to send messages; the apparatus used to receive messages.

Chapter II.—*AERIALS AND GROUNDS*. Where to put up the aerial; types of aerials; the "T" aerial; the masts; the wire; insulators; leading in the wires; the ground.
Chapter III.—*HOW TO BUILD AND OPERATE THE SIMPLEX DOUBLE SLIDE RECEIVING OUTFIT*. The tuning coil; the tube; the sliders; the fixed condenser; the detector parts; assembling the set; connecting the instruments; operation.
Chapter IV.—*HOW TO BUILD THE SIMPLEX LOOSE COUPLER, DETECTOR AND CONDENSER*. The base; the primary; the secondary; the pillar; the switch; How to make the Simplex cat whisker detector; How to make the Simplex fixed condenser; How to connect the apparatus; How to tune with the loose coupler; How to adjust the detector.
Chapter V.—*TELEPHONE RECEIVERS AND HEADBANDS.*
Chapter VI.—*HOW TO BUILD THE SIMPLEX SPARK COIL.* The core; the secondary; the condenser; the coil heads; the base; the interrupter parts; the bridge.
Chapter VII.—*HOW TO MAKE THE SIMPLEX KEY*.
Chapter VIII.—*HOW TO CONNECT AND OPERATE THE APPARATUS*. How to connect and operate a complete wireless station; How to operate; the code, etc.

*Three New Books on Home Made*

*Electrical Apparatus*

The Book you are now reading is only the first volume of "Home-made Electrical Apparatus." Written in a very clear and simple style, the other volumes are invaluable to the young experimenter. There are no old or obsolete forms of apparatus described but only the latest electrical devices, making them

*The Most Thorough and Complete Books for*

*the Young Electrical Experimenter Published*

The partial Table of Contents below only gives a small idea of the interesting matter contained in these volumes.

VOLUME II

72 Pages 55 Illustrations

Table of Contents
Chapter VI—ELECTRICAL MEASURING INSTRUMENTS. Galvanometers, Ammeters, Voltmeters, etc.
Chapter VII—CURRENT CONTROL DEVICES. How to Make a Pole Changing Switch or Current Reverser. How to Reverse Small Motors. Battery Rheostats.
Chapter VIII—HOW TO MAKE A TELEGRAPH KEY AND SOUNDER. How to Install a Telegraph Line and Learn to Operate. Learning the Morse Code.
Chapter IX—HOW TO MAKE AND INSTALL A TELEPHONE.
Chapter X—MEDICAL COILS AND SHOCKING COILS.
Chapter XI—THE CONSTRUCTION OF SPARK COILS. A one-quarter inch Coil, a one-half inch Coil, a one inch Coil. Experiments with Spark Coils.
VOLUME III

80 Pages 73 Illustrations

Chapter XII—HOW TO MAKE A DYNAMO-MOTOR.
Chapter XIII—HOW TO MAKE A TOY BATTERY MOTOR.
Chapter XIV—HOW TO BUILD AN ELECTRIC ENGINE.
Chapter XV—MINIATURE BATTERY LAMP LIGHTING.
Chapter XVI—COHERER OUTFITS FOR WIRELESS TELEGRAPHY.
Chapter XVII—HOW TO BUILD A TESLA HIGH FREQUENCY COIL. Experiments with High Frequency Currents.
Chapter XVIII—AN EXPERIMENTAL WIRELESS TELEPHONE.
Chapter XIX—MISCELLANEOUS APPARATUS. Electrolysis of Water. Electro-Plating. Electricity from Heat. A Handy Light. An Experimental Arc Lamp. A Magnetic Diver. Magnetic Fish. A Magnetic Clown. An Electric Breeze. A Static Motor.

*Price Postpaid, 25 Cents per Volume*

All three volumes can be supplied bound together with handsome cloth cover for $1.25 postpaid.

*Parts and Materials*

For Building the Apparatus Described in this Book

We have received so many requests from our customers for information as to where they may obtain some of the materials required to build the apparatus described in this book, that we have made arrangements to supply same. Our business is essentially publishing, and we do not intend to go into the manufacture of, or to push the sale of apparatus or parts. Knowing, however, that many of our customers live where they are remote from cities or suitable supply houses, where they might obtain the necessary materials, we believe that the value of our books will be increased ten fold to the reader if we are in a position to furnish parts, etc.

*M500* Complete Set of Parts for Dynamo illustrated in Figure 132 *$3.75*

Shipping Weight, 5 lbs.

*M631* Complete Set of Parts for Tesla Coil *4.50*

Shipping Weight, 4 lbs.

*M631A*
Completed Tesla Coil *6.00*

Shipping Weight, 10 lbs.

*M631B*
Complete Tesla Coil Outfit, consisting of Tesla Coil, two-inch
Spark Coil, Spark Gap and Leyden Jars *25.00*

Shipping Weight, 25 lbs.

Please use list number when ordering. Include postage to pre-pay mailing charges, or we will ship by Express Collect. No parts supplied other than listed above. All prices subject to change without notice. Send for latest price list.

*COLE & MORGAN, Inc.*

P.O. Box 473, City Hall Sta. New York, N. Y.