Preston, Thomas, Joly, Charles Jasper, 1864-1906, Parsons, John Herbert, Sir, 1868-1957, donor, University College, London. Library Services · London : Macmillan and Co. · leaf 485
otated. Hence the light emerging from the two halves of the field is polarised in planes which are inclined to each other. The angle between the planes of polaris- ation can be varied by varying the thickness of the interposed glass plate. 278. Soleil's Compensator and Saeeharimetep. — In the… … Fig. 213. called the compensator, and is similar to Babinet's compensator (Art. 244) only in so far as it consists of two quartz wedges ahc and def (show^n exaggerated in Fig. 213), of which one can slide on the other along their common face so that their joint thickness may be varied. In this…
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