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 146
veral modes inwhich such may be constructed. The usual mode is to take awedge of spar cemented to a corresponding wedge of glass. The extraordinary beam (that is to say, the beam whose vibrationsare executed in planes parallel to the crystallographic axis) goesstraight through the ordinary beam,… … i26 LIGHT lect. transmit only vertical vibrations, while the double-imageprism is rotated it is observed that when, as in Fig.88, the two images are in the position vertically aboveone another, the ordinary is cut off, while the extra-ordinary is transmitted. On turning round the double-image prism…
Light · X-rays
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