There are no old or obsolete forms of wireless apparatus discussed, but only the latest types of tuning coils, receiving transformers, fixed condensers, keys, spark coils, detectors, etc. The book is illustrated by numerous detailed working drawings giving all dimensions. Several full-page views of the apparatus enable the beginner to fully comprehend the text. *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