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