Diamonds and precious stones, a popular account of gems .. (1874)
Dieulafait, Louis, b. 1830, Sanford, Fanchon, tr · New York, Scribner, Armstrong, and Company · leaf 41
transparent bodies variesgreatly. This variation is generally connected withdifferences in the nature and composition of the re-fracting bodies; but it is likewise intimately con-nected, as experiments prove, with the molecular 20 PRECIOUS STONES. constitution of these bodies. For example,… … Fig. i6.—Course of a luminous ray in a homogeneous medium. Double Refraction.—Among diaphanous bodiesthere is a numerous class of substances that possessthe curious quality of presenting two images of oneobject. If a crystal of Iceland spar is placed upona piece of white paper bearing an…
Precious stones · Diamonds · Gems
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