Society of Glass Technology · [Sheffield] · leaf 667
osition on a member, 10,which rests on a bed, 15,of refractory material, 15. The top concave surface is shaped tofit the outer convex surfaces of the members, 10 and 14, and issmoothly finished so as not to injure the lens blanks. An insulator,16, is adapted to cover and overlap the hole, 11, in… … Fig. 182. GLASS : MANUFACTURE AND PROPERTIES. 267
Glass
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