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25 cents aerial amateur better binding posts Blue Book brass catalog choke coil circuit coherer connected constructed copper wire core diagram diameter dictograph direction distance electric waves Electro Importing electrolytic detector galvanometer Gernsback interrupter give glass hard rubber hole i/2 inch inch spark inch thick inch wide inches long instruments invention lamp Leyden jars magnet mention Modern Electrics messages metal meter miles mirror Modern Electrics Publication operation oscillations paraffine Patent phosphor bronze piece plate platinum point pointer postpaid potentiometer primary radiations resistance rheostat sald screw Send Serlal sextant shown in Fig signal to Mars silicon sliders soldered spark coil spring stamp storage battery strument switch tele telegraph tion transmitting tuner tuning coil vibrator wave length wireless apparatus WIRELESS EXPERIMENTER wireless station wireless telegraphy Wollaston wire writing please mention York City YORK When writing zinc spark gap