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