The member 12 is made of a material having {HEAD ~ a low coefficient} of thermal expansion and {TAIL ~ high thermal conductivity}, such as sapphire or ruby 
of
The member 12 is made of a material having { HEAD ~ a low coefficient } of thermal expansion and { TAIL ~ high thermal conductivity } , such as sapphire or ruby
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH