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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 63

An illustration from Light visible and invisible : a series of lectures delivered at the Royal Institution of Great Britain, at Christmas, 1896, 1897, leaf 63 — see it, as the pin mustbe held exactly in the right place.You know you are holding it with the head up, yet yousee it with its head down, looking as in Fig. 31. Nowif in the case where you know that its shadow isbeing thrown upright on the back of your eye youfeel the shadow upside down, it follows… … Fig. 29. I LIGHTS AND SHADOWS 47 persons have the cartilaginous walls of the eyeballs too

Light · X-rays

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