Light visible and invisible : a series of lectures delivered at the Royal Institution of Great Britain, at Christmas, 1896 (1897)
Thompson, Silvanus Phillips, 1851-1916, Royal Institution of Great Britain · New York : Macmillan · leaf 293
urce so that the shadows cast byobjects are more sharply defined.Here are two still more recent tubes(Figs. 144, 145) constructed for meby Mr. Bohm, in which the focus prin-ciple is preserved; but in which thereis the improvement that the anti-kathode T is not used also as an anode. It is… … Fig. 143. VI RONTGEN LIGHT 267 used as anode. The tube (Fig. 145) has two concaveelectrodes, either or both of which may be used as
Light · X-rays
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