A popular treatise on gems, in reference to their scientific value; a guide for the teacher of natural sciences, the jeweller, and amateur: together with a description of the elements of mineralogy, and all ornamental and architectural materials .. (1859)
Feuchtwanger, Lewis. [from old catalog] · New York, D. Appleton & company · leaf 54
macrodia-gonal is thus multi-plied by any numbern greater than 1, andplanes drawn fromthe distance n to thepolar edges, a newpyramid is produced,named a macropyra-mid, with the sign??iP7^,, the mark overthe P pointing outthe axis enlarged.When n=oo a ma-crodome results, with the sign mPco . If the… … Fig. 50.
Precious stones · Building stones · Mineralogy
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