One example of the spacer means is a cylindrical cap made of {TAIL ~ a ceramic material}, {HEAD ~ the cap} being disposed at the top of the capsule and secured thereon 
One example of the spacer means is a cylindrical cap made of { TAIL ~ a ceramic material } , { HEAD ~ the cap } being disposed at the top of the capsule and secured thereon
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH