Society of Glass Technology · [Sheffield] · leaf 742
ubular hollow stem,and is made of iron with a protectivelayer of refractory material such asfireclay. Water is circulated throughthis cooler by means of the pipes, 8and 13. In carrying out the operation,the portion of the surface of the glassis cooled, and the cane is drawn fromthe spot thus… … Fig. 1S9. 413. Thermionic Valve Manufacture. F. C. Fischer andThe Western Electric Co., New York (U.S.A. Pat., No. 1409339,March 14th, 1922. Filed October 15th, 1919, No. 330783).—Thespecification relates to the manufacture of thermionic valves( vacuum tubes ) in which the filament and the grid and…
Glass
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
