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    • Velocity of Second Sound in Liquid Helium II - Nature

      Nature· 2 days ago

      The helium was cooled by the demagnetization method using hydrated iron-ammonium-alum crystals immersed in the liquid. The remainder of the bath contained the apparatus for the generation and ...

    • Pulsed Gaseous Maser - Nature

      Nature· 2 days ago

      OPTICAL, maser oscillation has been obtained during the recombination period following a pulsed radiofrequency or d.c. discharge in helium mixed with either neon or carbon monoxide at wave-lengths ...