. 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 . one which consists of the aerial, single or double slidetuning coil, crystal detector, condenser and head tele-phone receivers. It has been noted before, but is worthrepeating that such a set cannot be used with any markeddegree of success for receiving beyond 20 or 25 miles, andthe amateur who anticipates hearing concerts
. 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 . one which consists of the aerial, single or double slidetuning coil, crystal detector, condenser and head tele-phone receivers. It has been noted before, but is worthrepeating that such a set cannot be used with any markeddegree of success for receiving beyond 20 or 25 miles, andthe amateur who anticipates hearing concerts or ad-dresses sent out from stations at a much greater distancewill be disappointed except under unusual can a loud talker be used on such a set with any de-gree of satisfaction. The element lacking for this is somesystem of amplifying the waves to make them more pow- MIRACLE OF THE AGE 211 erful and pronounced when they reach the receivingphones. The diagram shows such a circuit. Almost every article written on the principles of radiodescribe such a set as that referred to above though someof them omit the condenser. In such sets however, theantenna and the earth beneath it form two opposing ele-ments of a condenser, having what is technically termed.
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Keywords: ., bookcentury1900, bookdecade1920, bookidradiomiracle, bookyear1922
