While {HEAD ~ canister} 42 is shown as a cylindrical cross section, conical cross section elements may be employed in {TAIL ~ alternative embodiments} 
While { HEAD ~ canister } 42 is shown as a cylindrical cross section , conical cross section elements may be employed in { TAIL ~ alternative embodiments }
OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL