c) applying {HEAD ~ said open face} of {TAIL ~ said detector casing} to said honeycomb structure at the end of the cells thereof remote from said support whereby air supplied to said first compartment is able to flow into at least those cells of said honeycomb structure which are covered at least partly by said first compartment 
c ) applying { HEAD ~ said open face } of { TAIL ~ said detector casing } to said honeycomb structure at the end of the cells thereof remote from said support whereby air supplied to said first compartment is able to flow into at least those cells of said honeycomb structure which are covered at least partly by said first compartment
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH