Letter | Published:

Propagation of Pulses of Second Sound in Liquid Helium II

Nature volume 162, pages 213214 (07 August 1948) | Download Citation



PRELIMINARY measurements of the velocity of second sound in this Laboratory using a resonator of fixed length and signals of a variable frequency have given results in good agreement with the resonance measurements of Peshkov1 and of Lane, Fairbank and Fairbank2. In the course of these experiments it became apparent that if measurements were to be extended below 1° K., some method would be necessary which used a smaller mean power input. It can be shown, too, that the amplitude of temperature oscillation obtained in a resonance experiment is governed entirely by damping, and provides little information about the propagation of travelling waves in the medium.

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  1. 1.

    , Phys. Soc. Camb. Conf., 19 (1946).

  2. 2.

    , , and , Phys. Rev., 71, 600 (1947).

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  1. Royal Society Mond Laboratory, Cambridge. June 22.

    • D. V. OSBORNE


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