Society of Glass Technology · [Sheffield] · leaf 753
friction and so to give an indicationof the necessity, or otherwise, for fresh lubricant. The apparatuscan be modified still further by utilising the variations of load onthe electric motor driving the polishing machine to operate a switchcontrolling an auxiliary circuit. Such auxiliary circuit is… … hkts. Fig. 203. could be ground to gauge (Fig. 203). Bracket A could be adjustedby means of a screw, B, the lenses being placed between the clamping GLASSWARE ACCESSORIES. 309 jaws and centred by means of an angle, C (not shown in plan).D was a clamping spring, E a tension spring, and the screw,…
Glass
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