A support plate forms the base of {HEAD ~ the monolithic structure} with the cathodes mounted thereon and a face plate structure marginally sealed to {TAIL ~ the support plate} provides a vacuum tight envelope housing the monolithic structure 
A support plate forms the base of { HEAD ~ the monolithic structure } with the cathodes mounted thereon and a face plate structure marginally sealed to { TAIL ~ the support plate } provides a vacuum tight envelope housing the monolithic structure
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH