PROFESSOR RICHTERA, in Austria, is teported to be able to measure the one ten-millionth of a@ metre’s growth of a plant, and to make the sound of the plant’s growth audible. He proposes to broadcast this sound.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290222.2.60
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Radio Record, Volume II, Issue 32, 22 February 1929, Page 24
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37Untitled Radio Record, Volume II, Issue 32, 22 February 1929, Page 24
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