X rays, an introduction to the study of Röntgen rays (1914)
Kaye, G. W. C. (George William Clarkson), 1880-1941 · London : Longmans, Green · leaf 127
us obtainable, a match beingmade against a silver plate 0\11 mm. thick. Other hard-ness measurers by Wehnelt (who also uses an aluminium 1 Benoist (C.R. 1902) based the theory of his instrument on the curves dis-played in Fig. 54, which go to show that while the transparency of aluminiumalters a… … Fig. 55.— Benoists penetrometer. THE ENERGY OF X RAYS 105 wedge), Walter (a sequence of Pt discs), and Bauer (anelectrostatic voltmeter) are in common use. The corre-sponding hardness-numbers are all much the same asBenoists, except those of Wehnelt, which are 50 per cent,bigger for the same…
X-rays
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