Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 121
shed with iron tools, of the same diameter as the surface to be worked, each tool being laid off into 84, FORM—GLASS six sections, as in Figs. 3, 4, 5, 6, 7. The tool being warmed,pitch is spread over its leaf-like spaces, which are given the propercurve by being pressed down on the previously… … Tools for producing optical surfaces.John A. Brashear, Allegheny, Pa. the widest part of the leaflet, but in order that no zonal error maybe introduced, as in b, c, c, b, of the second figure, it is gentlytapered in each direction, the amount of taper being governed bythe lateral stroke given to…
Inventions · Inventors
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