Society of Glass Technology · [Sheffield] · leaf 588
ce, 31, through a partly closed valve, 40, into a cylinder, 33,causing a piston, 34, to rise and, by means of levers, 36, 38, 39,to open the valve, 40, gradually, thus opposing less resistance tothe rise of the piston, 24, to compensate for the increasing weightof the glass cylinder being drawn. In…
Glass
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
