Society of Glass Technology · [Sheffield] · leaf 646
tages were found:—(1) glass could not besatisfactorily annealed, owing to the arch being further away fromthe glassware in tKe centre of the lehr than at the sides; (2) toobtain sufficient heat to anneal the glass properly in the centreof the lehr, it was often found that the glass at the sides… … Crou Sr.cinn nHovui Smnit t^urnt Lcim FiRi-Ron. Fig. ITil. since the flame did not come into contact with the glass. Thecircular arch muffle type lehr prevented the bloom, but owing tosevere loss caused by breaking of tiles, particularly in the centreof the arch, the Simplex muffle lehr was…
Glass
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