The second plate has an outwardly extending indicating plate with a pair of {TAIL ~ spaced pins}, and an indicating strip for measuring the height of liquid collected in {HEAD ~ the compartment} 
The second plate has an outwardly extending indicating plate with a pair of { TAIL ~ spaced pins } , and an indicating strip for measuring the height of liquid collected in { HEAD ~ the compartment }
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 HEAD HEAD HEAD HEAD HEAD HEAD