Society of Glass Technology · [Sheffield] · leaf 576
aped with bridges, 8, to which the frames arebolted. The turns of the strip, 7, may be spaced by notchedinsulators, 25 (Fig. 59), with rectangular blocks, 26, fitting intothe notches. A cover, 21, has a central aperture, 23, for a chainsupporting the work. H. G. C. 123. Tunnel Furnaces. A. Bigot,… … Fig. 60. tunnel structure is double-walled with an intermediatefilling, h (Fig. 60), ofnon-conducting material,and the moving parts, suchas the supporting plates, a,for the goods, and the balls,b, on which they run, aremade of highly refractorysubstances. Fused bauxites,corundum and…
Glass
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