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… … Fig. 46. Fig. 47. with a refracting angle of 1350 is immersed in a glass cell filled withcinnamic ether. Yellow light, as shown in Fig. 47, goes straightthrough, while red light is thro vn to one side and violet to the other.This prism is very suitable for projecting the spectrum on the screen. ii…
Light · X-rays
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