Abstract
USING a specially constructed rectifier giving 1,100 volts and a Taylor T 55 valve with amphenol bases and special inductances, frequencies up to 100 megacycles per second have been produced. A tourmaline plate prepared in this laboratory with a thickness of 2 mm. and a fundamental of about 2 Mc./sec. is made to oscillate up to its 54th harmonic, and at all stages it could be employed to maintain stationary waves in a column of water in the usual manner. Diffraction patterns at almost all the frequencies in the range 2 to 100 Mc./sec. could be observed. The highest frequency so far adopted1 for such work is only 52.5 Mc./sec. In order to detect dispersion, if any, of ultra-sonic velocity in water, the crystal has been simultaneously excited by us at two frequencies and both patterns photographed on the same plate at the same instant.
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References
Bär, R. Proc. Ind. Acad. Sci., A, 8, 289 (1938).
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BHAGAVANTAM, S., RAO, B. Diffraction of Light by Ultra-Sonic Waves of Very High Frequencies. Nature 158, 484 (1946). https://doi.org/10.1038/158484a0
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DOI: https://doi.org/10.1038/158484a0
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