Abstract
THE volume under notice forms an important contribu tion to the study of high vacua, and its publication emphasises the great improvements which have been effected in experimental methods during the past ten years. Chap. i. deals with various types of pumps, special attention being given to molecular pumps and to mercury vapour pumps. Chap. ii. is concerned with manometers. Some miscellaneous questions, such as the construction of connecting tubes, the elimination of occluded gas, and the analysis of residual gases, are discussed in Chap. iii.; and the last chapter deals with the production or improvement of a vacuum by means of absorbing materials or the electric discharge. The author rightly attaches great importance to the work of Martin Knudsen on the flow of gas rarefied to such a degree that the mean free path of the molecules has become large in comparison with the diameter of the tube.
La technique du vide.
L.
Dunoyer
Par. (Recueil des Conférences-Rapports de Documentation sur la Physique. Vol. 7, 1re Série, Conférences 17, 18. Édité par la Société Journal de Physique. ) Pp. 225. (Paris: Les Presses universitaires de France, 1924.) 15 francs.
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La technique du vide . Nature 116, 205 (1925). https://doi.org/10.1038/116205c0
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DOI: https://doi.org/10.1038/116205c0