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 142
h it; you will see two fingers. It is asubstance which splits the waves of light into two parts,giving two images; and, moreover, polarises the light inthe act of splitting it, so that each part is polarised.We do not, however, want both images; we want onlyone. What do we do ? We adopt the method… … Direction »>» >/- of Light Fig. 80. Nicol prisms of various sizes; and also several modernmodificationsl of the Nicol prism. Here also is a largewooden model to illustrate Nicols method. 1 In Foucaults modification, a film of air is interposed betweenthe two wedges of crystal. In Ilartnacks…
Light · X-rays
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