. 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 . Copyright, InternationalONE INCH SQUARE RADIO SETAlfred Giovanni, a fourteen-year-old freshman in the United HighSchool at Knoxville, Pa., with his one inch square radio receivinginstrument, probably the smallest of its kind in the world. The instru-ment is capable of picking up radio messages for a distance of morethan fif
. 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 . Copyright, InternationalONE INCH SQUARE RADIO SETAlfred Giovanni, a fourteen-year-old freshman in the United HighSchool at Knoxville, Pa., with his one inch square radio receivinginstrument, probably the smallest of its kind in the world. The instru-ment is capable of picking up radio messages for a distance of morethan fifteen miles, and is complete in every Copyright, International RECEIVING CROP REPORTS BY WIRELESSNo science in recent years has had such strides as has the scienceof radio. The Chicago Board of Trade has just inaugurated a system ofbroadcasting market reports for the information of farmers and thoseinterested in the production and marketing of Americas foodstuffs. Thephoto shows Charles Daugherty, who is a farmer in Champaign, crop reports by the radio way. MIRACLE OF THE AGE 49 higher in the interior of very large thunderclouds. In abig lightning flash the current may be some ten thousandsof amperes. But it lasts only a very short time, one ten-thousandths of a second or less. Therefore, the power ofthe lightning flash is enormous, from hundreds to thou-sands of millions of horsepower, many times larger thanthat of Niagara. But it lasts only such a very short time,less than one ten-thousandths of a second, so that itsenergy is very small, less than that of a pint of destructiveness of lightning
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Keywords: ., bookcentury1900, bookdecade1920, bookidradiomiracle, bookyear1922
