Yes, I continue advancing the greatest engine ever onvented

Followers who tack my progress know this is about getting magnetic power as soon as possible from the piston action, then going all magnetic power drive fully and infinite geared system.
So the piston to current driver, the reverse solenoid, would great if it had circular magnetic flow.  I want a standard power transformer with circular iron core, except the primary coil moves up and down its shaft, here is my fourth sketch, incomplete.

The drawing is about an enclosed iron drum with the return path being a centered iron shaft over which the primary coil is driven by a piston action. The four sketches comprise my world wide patent acknowledgement, thus doubling my usual fee: