There is a dead point when rotating wheel by a piston. And wheel cannot be rotated. By driving the left and right wheels in a different phase, it can be overcame and wheels are rotating smoothly. Smoke comes out from chimney. Smoke is made in the right white cylindrical box. From the left mechanism, Air is injected into the chimney. Smoke is emitted when the candle wax is heated at about 100 degree Celsius in the box. And it is sent out from the box by fan. Smoke-rings come out from the chimney when air is injected rapidly into the chimney. The air gets momentum by a rubber-blower. • Tricycle-play: Automata: Automaton:Wood Ca...