This
motion is transmitted in waves of varying intensity and frequency which
are sent into space by the mechanism of the broadcasting station, which
consists of a sound conducting apparatus induced by strong electrical
currents from generators or batteries and extensive aerial or antennas
wires high in the air. Thus sound is converted into waves, and the
receiving station, as you see here, with its aerial on the roof, its
detector, its 'phone and its tuner, gets these waves and turns them
again into sound. That is the outline of the thing, which you will
understand better 'after' than 'before using.'
"The technical construction of the radio receiving set is neither
difficult nor expensive; it is described fully in several books on the
subject and I shall be glad to give any of you hints on the making and
the operation of a receiving set. The 'phone receivers and the crystal
detector will have to be purchased as well as some of the accessories,
such as the copper wire, pulleys, battery, switches, binding posts, the
buzzer tester and so forth. With proper tools and much ingenuity some of
these appliances may be home-made.
"The making of the tuner, the wiring, the aerial and the assembling are
all technicalities that may be mastered by a careful study of the
subject and the result will be a simple and inexpensive set having a
limited range. With more highly perfected appliances, as a vacuum, or
audion tube, and an aerial elevated from sixty to over a hundred feet,
you may receive radio energy thousands of miles away.
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