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 101
Fig. 45. is placed in a nearly parallel beam of light issuing fromthe lantern. Beyond it is a lens to focus the light. 1 This liquid is excellent for direct-vision prisms, for it hasexactly the same mean refractive index as one kind of the lightcrown glasses made at Jena. Figs. 46 and 47 depict the…
Light · X-rays
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