Society of Glass Technology · [Sheffield] · leaf 520
ually to blow theparison. Continued movement of the hand lever causes the nut,18, to make contact with the gland, 16, the spring, 15, is then com-pressed, and the duct, 13, opened fully. By this arrangement,the full pressure of the air is not admitted at once to the parisonwithout effort on the…
Glass
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
