The chamber may, however, be leaky to allow the sealing members previously described to operate as one way {HEAD ~ valves} which would then prevent {TAIL ~ exterior air} from entering into chamber 56 during firing of the ceramic ware 
prevent
The chamber may , however , be leaky to allow the sealing members previously described to operate as one way { HEAD ~ valves } which would then prevent { TAIL ~ exterior air } from entering into chamber 56 during firing of the ceramic ware
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH