Abstract
A SHOUT time ago Pitt and Jackson1 measured the velocities of ultra-sonic waves at the temperatures of liquid air and liquid hydrogen, using a vibrating quartz plate as a source. When an attempt was made to continue the experiment in liquid helium, it was found impossible to get the plate to oscillate vigorously; this led to the suspicion that quartz might show an anomaly in its piezo-electric effect at the temperature of liquid helium.
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References
Pitt and Jackson, Canad. J. Research, 12, May, 1935.
Onnes and Beckman, Leiden Comm., No. 132f (1912).
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BURTON, E., PITT, A. & McKINLEY, D. Velocities of Ultra-sonic Sounds. Nature 137, 708 (1936). https://doi.org/10.1038/137708a0
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DOI: https://doi.org/10.1038/137708a0
