Society of Glass Technology · [Sheffield] · leaf 576
Fig. 122. from the air-heater, 35,the burners, gas being … Fig. 123. 198 JOURNAL OF THE SOCIETY OP GLASS TECHNOLOGY. of the kiln to the exhaust fan, 49. The passages, 45, are sealedfrom the interior of the kiln by sand seals, 53, in which move thedown-turned edges of a plate on the truck. Cold or tempered airmay be admitted to the kiln by shutting a valve…
Glass
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