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A simple Linde helium liquefier-cryostat combination is described which has a liquefaction rate of 800 c.c./h combined with reasonable economy in the use of liquid hydrogen. It is suitable for experiments down to 1.3° K, either by mounting the apparatus in an inner vacuum chamber and cooling it by condensation or by direct immersion down a 9.8 mm bore tube to the main helium bath.
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David H. Parkinson (1954) studied this question.
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