Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 55
of different density; for this purpose he used fragments of flint- and of crown-glass, but did notsucceed in making object-glasses with a larger aperture than 2 or 3 inches in diameter; and whenthe need of telescopes of greater magnifying power was strongly felt, it was difficult to produce… … GLASS, MANUFACTURE OF. 47 in working and stirring the material while in a state of fusion, by means of a tool made of the samematerial as the crucible or glass-pot. He made a hollow cylinder of fire-clay of the same height asthe crucible, closed at its lower extremity and open above, with a flat…
Mechanical engineering -- Dictionaries
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