Diamonds and precious stones, a popular account of gems .. (1874)
Dieulafait, Louis, b. 1830, Sanford, Fanchon, tr · New York, Scribner, Armstrong, and Company · leaf 42
an inscription, as inFig. 17, two images will be visible of every point. OPTICAL PROPERTIES. 21 and both images will show deviation. This is aninstance of what is called double refraction. When a body, crystallized or not, is perfectlyhomogeneous in all its parts, so that its elementsare disposed… … Fig. 17.—Double refraction of Iceland spar. Crystals belonging to the monometric or tesseralsystem, as the cube or octahedron, since their mole-cular disposition is perfectly regular, never exhibitthe phenomenon of double refraction, in whateverdirection they are traversed by the light; but…
Precious stones · Diamonds · Gems
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