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