Such sensing devices may, for example, detect the acceleration, speed or position of the piston of {HEAD ~ such a system} relative to {TAIL ~ the corresponding cylinder}, for example 
Such sensing devices may , for example , detect the acceleration , speed or position of the piston of { HEAD ~ such a system } relative to { TAIL ~ the corresponding cylinder } , for example
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 REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH