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