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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 308
Fig. 152.—Hand of Professor \V. Crookes, K.R.S. … Fig. 153.—Hand of Rt. Hon. Sir Richard Webster, M.PLight · X-rays
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