Society of Glass Technology · [Sheffield] · leaf 574
e of similar material to the sides, 26 and 27, orto the furnace walls, The walls of the muffle shown m Fig. 57(a) and (b) may be pierced with holes to ensure more direct heating,or may be of porous material. In the crucible furnace shown inFig. 57 (c), the sides, top, and bottom of the furnace are… … 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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