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Books Books 1 - 1 of 1 on ... thinge, a great distance, and specyally by the ayde of other glasses. [Here we....
" ... thinge, a great distance, and specyally by the ayde of other glasses. [Here we have the principle of the Refracting Telescope.] . . . the smallest sorte of them, commonly called spectacle glasses . . . ys grounde vppon a toole of Iron, made of purpose,... "
Descartes and the Hyperbolic Quest: Lens Making Machines and Their ... - Page 13
by D. Graham Burnett - 2005 - 152 pages
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Ad librum de naturis superiorum et inferiorum (prefatio)

James Orchard Halliwell-Phillipps - Algorismus - 1839 - 120 pages
...Iron, made of purpose, somewhat hollowe, or concave inwardes. And may be made of any kynde of glasse, but the clearer the better. And so the Glasse, after...vppon a smalle block, and so grounde by hande, vntill that yt ys bothe smoothe and allso thynne, by the edges, or sydes, but thickest in the middle. And...
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