Dr. J. H. Dellinger, chief of the radio laboratory of the Bureau of Standards, U.S.A. before leaving for Europe on a three months’ tour, sent Canada a piezo oscillator as a means of checking the frequencies of its broadcasting stations, thus avoiding possible radio disputes between the United States aud Canada. It is now possible to govern the ‘frequency of a broadcasting station to within a few cycles by use of the piezoelectric effect,
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https://paperspast.natlib.govt.nz/periodicals/RADREC19280217.2.37
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Radio Record, Volume I, Issue 31, 17 February 1928, Page 14
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74Untitled Radio Record, Volume I, Issue 31, 17 February 1928, Page 14
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