Society of Glass Technology · [Sheffield] · leaf 575
of 92 JOURNAL OF THE SOCIETY OF GLASS TECHNOLOGY. permit circulation of the gases. Fig. 57 shows a crucible furnacein which the cover, 39, is similar to that shown in Fig. 57 (b). H. G C. 122. Electric Furnaces. General Electric Co., Schenectady,New York, U.S.A. (Assignees of E. F. Collins,…
Glass
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