Various methods of insulation have been investigated at temperatures between 0·2 and 1° K. A simple suspension of artificial silk fibre reduces the heat flow to 5 ergs/min.; ‘guard rings’ at the same low temperature reduce the heat flow to 1 erg/min. The origin of the heat flow in various experimental arrangements is considered in its bearing on the technique of the magnetic method of cooling.
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Cooke et al. (1942) studied this question.
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