Diamonds and precious stones, a popular account of gems .. (1874)
Dieulafait, Louis, b. 1830, Sanford, Fanchon, tr · New York, Scribner, Armstrong, and Company · leaf 278
Fig. 98.—Cubic System. Fig. 99.—Regular Octahedron. derived forms ; and when the cutting of diamondsbecame known in the Indies, it was necessarily dia-monds of this class that had to be operated upon. … Figs. 100 and toi.—Common Forms of the Diamond. Accordingly, when we examine the figures of ancient Indian diamonds given by Tavernier and Bernier, we find that the primitive style of cutting in India was to take an octahedron, replace one of 17 258 PRECIOUS STONES. the points by a plane…
Precious stones · Diamonds · Gems
Internet Archive · Boston Library Consortium · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Cosmographia in qvatvor libros distribvta summo ordine, miraqve facilitate, ac breuitate ad magnam Ptolemæi mathematicam constructionem, ad vniuersamque astrologiam institutens. Francisco Barocio ... avtore. Cum præfatione eiusdem autoris, in qua perfecta quidem astrologiæ diuisio, & enarratio autorum illustrium, & voluminum ab eis conscriptorum in singulis astrologiæ partibus habetur: Joannis de Sacrobosco verò 84 errores, et alij permulti suorum expositorum, & sectatorum ostenduntur. rationibusq[uam] redarguuntur. Præcesserunt etiam quædam communia mathematica, necnon arithmetica, & geometrica principia, nonnullæq[uam] propositiones, de quibus in toto opere sæpe fit mentio: ac demum locupletissimus index eorum, quæ ipsa Cosmographia continentur .. (1585)](https://img.insideoutlibrary.com/img/200/ia-cosmographiainqv00baro-127-49.webp)
