The movement of the nutating piston is recognizable. (One part of the housing and the wall in the middle are removed, and 1 piston in the last picture.)
|1 - rotary piston | 2 - rotary cylinder | 3 - housing | 4 - spherical combustion chamber | 6 - inlet | 7 - exhaust | 8 - air intake | 9 - rotary cooling fins | 10 - air outlet | 12 - dividing wall | 15 - piston ball bearing | 16 - working chamber
Drawing taken from German Patent Specification 2519911. There is a second kinematic version where the cylinder rotor is stationer and the piston nutating (see animation).