A liquid helium cooled finger has been fabricated to fit axially inside the standard Siemens cold finger. The apparatus has been used to examine a thinned copper transmission sample at a temperature below 29° K using a total liquid helium consumption of ten litres per hour. The temperature was determined by condensing Xe, Kr, Ar or N 2 on to the cold sample during observation.
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Piercy et al. (1963) studied this question.
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