Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 454
erty of doubly refracting, and.therefore of polarizing, is the mineral called tourmaline,w\nch. is a semi-trans-parent substance, different specimens having different tints. In Fig. 208, A,Bjrepresent theprismatic crystals of tourmaline, and C shows a crystal whichhas-been cut, by means of a… … Fig. 208. been polished, the plates form a convenient polarizer and analyser. Letus imagine one of the plates placed perpendicularly between the eye and alighted candle. The light will be seen distinctly through it, partaking, how-ever, of the colour of the tourmaline; and if the plaie be turned…
Inventions
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