Society of Glass Technology · [Sheffield] · leaf 734
tically and angularly on a slotted bracket, 59. Springs, 66,, MACHINERY FOR THE WORKING OP GLASS. 251 retract the pencils, any of which may be pressed inwardly toengage the object. Helical lines are marked by a pencil, 89, in acarrier, 75, movable vertically in a bracket, 69, 70, and engaginga… … Fig. 222. 22, when the carrier, 75, is moved up or down. Arcs of circlesand other curves may be marked by a pencil, 94 (Fig. 220), on ajointed compass or carrier, 99, pivoted to a pin, 95, which may bepivotally engaged in any one of a series of horizontal holes, 96, ina vertical plate or bracket,…
Glass
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