In the third working chamber, there is formed {HEAD ~ an oscillating column} of {TAIL ~ the working medium}, which presses against the inner sides of both pistons 
of
In the third working chamber , there is formed { HEAD ~ an oscillating column } of { TAIL ~ the working medium } , which presses against the inner sides of both pistons
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH