Society of Glass Technology · [Sheffield] · leaf 528
Fig. 7S. 206. Machinery for Drawing Glass Cylinders. A. E. Spinasse, U.S.A. (Brit. Pat. No. 114819, November 26th. 1917,No. 17474. Convention date, April 12th. Not yet accepted.Abridged as open to inspection under Sect. 91 of the Act).—Tndrawing glass cylinders, the hollow bait used is coated on… … to it, and the coating may be applied before, l)ut is preferablyapplied after, heating. Resin, tallow, oils, and waxes, or com-pounds of these materials, are mentioned as suitable substances forcoating an iron bait heated to about 400° F., and powdered lime,magnesia, etc., for a bait heated to…
Glass
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