. Radio, miracle of the 20th century ... a story of human achievement that stands unrivalled in the history of humanity, together with a colorful portrayal, giving a broad, general view of the whole subject of wireless telegraph and telephone and its marvelous development . ows it the greater thewaves. Just so it is with the radio waves. The moreamperes of current flowing in the antenna circuit and thegreater the pressure between antenna and ground, thenthe stronger the waves that are radiated. RADIO SOUND WAVES. Eadio waves are very similar to sound waves. If youstrike C on the piano the soun
. Radio, miracle of the 20th century ... a story of human achievement that stands unrivalled in the history of humanity, together with a colorful portrayal, giving a broad, general view of the whole subject of wireless telegraph and telephone and its marvelous development . ows it the greater thewaves. Just so it is with the radio waves. The moreamperes of current flowing in the antenna circuit and thegreater the pressure between antenna and ground, thenthe stronger the waves that are radiated. RADIO SOUND WAVES. Eadio waves are very similar to sound waves. If youstrike C on the piano the sound waves vibrate 256times per second, and either a C tuning fork or a wiretuned to i i C and in the immediate vicinity will vibrate256 times per second, also. These two wires are tech-nically described as being in resonance. Just so the radiowaves have a definite number of vibrations per secondand in order to hear a certain station the receiving equip-ment must be put in resonance with the waves radiatedby the transmitter. This is properly called tuning. An electrical current changing its direction of flow isknown as an alterating current. The frequency withwhich it changes its direction gives it its high frequency is meant a current which changes its. XL H J 5o%o HP <tj ft O o 5< o H <DO cP u c ^3-m O (H o B- beo to l| ni
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Keywords: ., bookcentury1900, bookdecade1920, bookidradiomiracle, bookyear1922
