. 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 . lear and strong. THREE FORMS OF CIRCUIT. After the waves are tuned-in their presence is de-tected. The now famous vacuum tube or a crystal de-tector is used for this purpose. The tube or crystal, asthe case may be, is adjusted so that the waves are de-tected in their passage from the aerial through the tunerand thence to th
. 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 . lear and strong. THREE FORMS OF CIRCUIT. After the waves are tuned-in their presence is de-tected. The now famous vacuum tube or a crystal de-tector is used for this purpose. The tube or crystal, asthe case may be, is adjusted so that the waves are de-tected in their passage from the aerial through the tunerand thence to the ground. What actually happens is thatthe detector rectifies the rapid wave vibrations or mo-tions and slows them down to a point where they willaffect the diaphragm of a telephone receiver and theybecome audible. So far all seems simple, but in coupling up circuits itmust be remembered that there are three basic forms ofcoupling: direct, inductive and are in these couplings primary and secondary cir- MIBACLE OF THE AGE 209 cuits. The primary circuit is that which forms the natu-ral wire path from the antenna to the ground. It mayhave incorporated in it coils, condensers or other bits ofapparatus, but there is a direct path along which the waves. EXAMPLE OF DIRECT COUPLING. or current would naturally travel to the ground. The sec-ondary circuit is that by which the waves or current aredeployed or diverted from the primary so that they travelaround the secondary and back again to the main circuit,and thence over their natural course to the ground. In
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