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