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