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Books Books 1 - 2 of 2 on ... must have a hollow iron dish, that is a portion of a great Sphaere, as you will....
" ... must have a hollow iron dish, that is a portion of a great Sphaere, as you will have your Spectacles more or less Convex; and the dish must be perfectly polished. But if we seek for Concave Spectacles; let there be an Iron-ball, like to those we shoot... "
Descartes and the Hyperbolic Quest: Lens Making Machines and Their ... - Page 12
by D. Graham Burnett - 2005 - 152 pages
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Transactions of the American Microscopical Society, Volume 28

Microscopy - 1908
...Spectacles; let there be an Iron-ball, like to those we shoot with Gun-powder from the great Brass Canon : the superficies whereof is two, or three foot about...Ball there is strewed white-sand, that comes from Vincentia, commonly called Saldame, and with water it is forcibly rubbed between our hands, and that...
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Transactions of the American Microscopical Society, Volumes 27-29

American Microscopical Society - Microscopy - 1907
...Spectacles ; let there be an Iron-ball, like to those we shoot with Gun-powder from the great Brass Canon : the superficies whereof is two, or three foot about:...Ball there is strewed white-sand, that comes from Vincentia, commonly called Saldame, and with water it is forcibly rubbed between our hands, and that...
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