{HEAD ~ An auxiliary piston} reciprocates in the other cylinder and is driven in timed relation to the working piston by {TAIL ~ means} of a cam affixed to the crankshaft and a cam follower attached to a connecting rod 
is driven by
{ HEAD ~ An auxiliary piston } reciprocates in the other cylinder and is driven in timed relation to the working piston by { TAIL ~ means } of a cam affixed to the crankshaft and a cam follower attached to a connecting rod
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH