Society of Glass Technology · [Sheffield] · leaf 517
serves to blow upthe parison. The pumpcylinder, 1 (Fig. 68), is securedbelow the table of the machineand its piston is moved bymeans of a hand lever, 35.The pump communicates by apipe, 21, with an air-space,49, in a casing, 20, whichencloses the rod, 16, of theplunger, 17, that forms themouth of… … MACHINERY FOR THE WORKING OE GLASS. 87 rod is connected to a pivoted arm, 11, which is drawn upwards by aspring, 9, to a point controlled by a screw, 7. The rod, 29 (Fig. 68),of the piston, 28, slides through a cross-piece, 46, upheld by springs,43, surrounding guide-rods, 41, 45, secured to the…
Glass
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