Society of Glass Technology · [Sheffield] · leaf 106
e Keith and the author. At the outsetit was realised tha^ draughts or any bodily movement of air insidethe lehr would be fatal to success, and this led to the adoption ofa tunnel lehr in the form of an inverted siphon (Fig. 2), with theentrance, at the short leg, lower in level than the exit at the… … Fig. 1. [To face Trans., p. 46. THE RE-ANNEALING OF GLASS. 47 track. The top and sides of thetunnel were formed of sheet ironfastened to angle iron tracks withthe exception of the firebox atthe apex of the hump. Two walls,each a single brick thick, shapedto the track and covered withfireclay slabs,…
Glass
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