FIG 2 shows the mobile plate 4 in the open position, i.e. in the minimum loss of head position and FIG 3 shows this plate in {HEAD ~ the maximum loss} of {TAIL ~ head position}, i.e. in the closed position 
of
FIG 2 shows the mobile plate 4 in the open position , i.e. in the minimum loss of head position and FIG 3 shows this plate in { HEAD ~ the maximum loss } of { TAIL ~ head position } , i.e. in the closed position
OTH OTH OTH OTH OTH OTH OTH 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 REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH