Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 457
on 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 theparticles have been thrown into a state of strain, as shown in the figure,distinct… … Fig. 211.—Iceland Spar showing Double Refraction- 4o8 LIGHT.
Inventions
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