Society of Glass Technology · [Sheffield] · leaf 719
an crucible, the lid being of asbestos withthe sides bent down. The lid of the outer chamber was coveredwith asbestos, but pierced so that a thermo-couple could be intro-duced. Observation was kept on the crucible by means of mirrorsbelow the lower aperture, either above or below the burners.… … Fig. 165. 383. Initial Heat Lehrs. W. S. Mayers {Glass Industry, 1923,4, 163).—At the instant of leaving the mould, heavy glass articlescontained sufficient heat to make them glow, but apparently thechilled skin caused them to retain their shape. A rapid transferenceof the article into a heated—and…
Glass
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