Society of Glass Technology · [Sheffield] · leaf 725
mation ofthe cap. The air is vented from avalve, 12, having a large port anda small port. During the first 22inches of the draw, while the capis being formed, a weight, 26,attached by a cord, 28, to thevalve lever, 18, keeps the smallport open. A catch, 35, thenstrikes a projection, 38, and… … 350. Drawing Glass Cylinders. C. Donaldson, J. J. Bloxsom,and J. K. Brooks (U.S.A. Pat,, July 29th, 1919, No. 1311804.Filed April 26th, 1917, No. 164774).—The invention consists of a
Glass
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
