Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 456
any pair formed by two of these. Fig. 209represents a polariscope, this instrument being designed to permit anydesired combination of polarizer and analyser, and having graduations formeasuring the angles, and a stage upon which may be placed various sub- 4o6 LIGHT. stances in order to observe the… … Fig. 209.—Polariscope. effects the doubly refracting power of substances can be recognized, wherethe observation of the production of double images would, on account oftheir small separation, be impossible. And the polariscope is of great service LIGHT. 407 in revealing structures in bodies which…
Inventions
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