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 144
otbe conveniently rotated, sothat it polarises the light ina fixed plane. To obviatethis defect, I devised anoptical rotator to placeon the end of the prism.This consists simply of twoplates, <]x and </.,, of quarter-FIG- 85. wave mica ; the first of them being mounted with its axis fixed at… … 124 LIGHT LECT. Let us devote a little further attention to this pheno-menon of the double-refraction that thus yields us twobeams of light that are polarised in different planes.Here is another wave-motion model (Fig. 86) constructedto show two sets of waves which are polarised in planesmutually…
Light · X-rays
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