Society of Glass Technology · [Sheffield] · leaf 467
ure by elasticmeans incapable ofchanging the curva-ture. In the grindingmachine shown, thelenses are mounted inholders on a pair ofspindles 10 driven inopposite directions bybands from the shaftof a grinding wheel,8, of parabolic orspiral, etc., section.The spindles may bemoved endways to liftthe… … Fig. 36. MACHINERY FOR THE WORKING OF GLASS. HO described in Specification 111716, and the polishing by a similartool covered with felt. The resilient surface may be provided bycork or sponge-rubber, or it may be a rubber disc under fluidpressure. H. G. C.
Glass
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