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 174
POLARISATION OF LIGHT 153 cooled, that is, has not been properly annealed by slowcooling down from the furnace heat, can always bedetected by the colours it shows when placed in thepolariscope between polariser and analyser. For such purposes a very simple polariscope, such asany ingenious boy… … with black varnish on its under side, and laid down on asimple frame of wood. Two other pieces of glass arecut of the size 8J by 5 inches. One of these is of clearwindow-glass, the other of ground glass. Across thelower part of the clear piece, and at if inch from itsedge, is cemented a strip of…
Light · X-rays
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