. An elementary book on electricity and magnetism and their applications. ng coils will be changed into a unidirectional current,which affects a telephone receiver. Radiotelegraphy 374. A simple sending station. Through the efforts of theItalian inventor, Marconi, and many others, electric wavesare now being extensively Aeriau used commercially for radio-telegraphy. A simple sending station,such as Marconi used inhis earliest experiments, isshown in figure 403. Theessential part is a conductorcalled the aerial or antenna,extending to a considerableheight above the electrical os
. An elementary book on electricity and magnetism and their applications. ng coils will be changed into a unidirectional current,which affects a telephone receiver. Radiotelegraphy 374. A simple sending station. Through the efforts of theItalian inventor, Marconi, and many others, electric wavesare now being extensively Aeriau used commercially for radio-telegraphy. A simple sending station,such as Marconi used inhis earliest experiments, isshown in figure 403. Theessential part is a conductorcalled the aerial or antenna,extending to a considerableheight above the electrical oscilla-tions are set up in this con-ductor like the oscillationsin the spark discharge shown in figure 396. These send wavesout through the ether just as a stick laid on water and shakenup and down sends out ripples over the surface of the way to set up oscillations in an aerial is to put a sparkgap in it and to send sparks across this gap by means of aninduction coil fed by batteries or by means of an alternator andstep-up transformer, as shown in figure O Spark9 Gap Fig. 403. Ground -=-Simple sending station. 552 ELECTRICITY AND MAGNETISM
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmagnetism, bookyear19
