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
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… … Fig. 8i improvements upon the original Nicol prism. In one of these, thenatural end-faces of the prism are sliced away parallel to thecrystallographic axis so as to leave terminal faces that are principalplanes (Fig. 81), and the crystal is then sliced with an oblique cut 122 LIGHT LI-XT. Selecting…
Light · X-rays
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