The piston and cylinder assembly is then used to subject the heated glass to the desired pressure, around 70,000 psi, and {TAIL ~ this pressure} is uniformly transmitted to the heated body of compacted powder that is immersed in {HEAD ~ the glass} 
The piston and cylinder assembly is then used to subject the heated glass to the desired pressure , around 70,000 psi , and { TAIL ~ this pressure } is uniformly transmitted to the heated body of compacted powder that is immersed in { HEAD ~ the glass }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD