Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 457
ion 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 with ordinary H^^ht appear entirelydevoid of it—such, for example, as quill, horn, whalebone, &c. Exceptliquids,… … Fig. 210. in the apparatus, shown in Fig. 210, a square bar of Avell-annealed glass jon examining it by polarized light, it will be found that before any pres-sure from the screw C is applied to the glass, ii. allows the light to passequally through every part of it ; but when by turning the screw…
Inventions
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