Society of Glass Technology · [Sheffield] · leaf 720
hermodern types; maintanence costs were low; and much space wassaved. W. C. S. 384. An Improved Muffle Lehr. C. L. Sharp, Lancaster,Ohio (U.S.A. Pat., No. 1447633, March 6th, 1923. Filed October20th, 1920, No. 418141).—A muffle lehr has a combustion chamberon each side and the hot gases are led… … Fig. 166. Fig. 167. and Fig. 167 the arrangement in plan of the heating channels beneaththe muffle chamber. The lehr is built up of side walls, and innerand outer crowns, 17, 5, respectively, the structure being bracedby tie rods, 10. The muffle chamber, 11, is built up of tiles, 12,14, 15, which…
Glass
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