b) connecting {HEAD ~ a supply} of {TAIL ~ compressed air} to said inlet means and connecting a flowmeter to said outlet means 
of
b ) connecting { HEAD ~ a supply } of { TAIL ~ compressed air } to said inlet means and connecting a flowmeter to said outlet means
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH