Abstract: At least two spaced apart eccentric weights are rotatably mounted about vertical axles. The weights are coupled to advance a drive mechanism in a single direction when the weights move about their respective axles in either direction of rotation. The drive mechanism is coupled to a flywheel mounted upon a vertical axle and rotatable therewith. The transducer may be mounted athwartship in a floating vessel or supported on a mast or other support which is subjected to wind or wave motion. The eccentric weights oscillate irregularly about their axles under the influence of the rolling and pitching motion imparted by wind or waves. The motion of the eccentric weights thereby drives the flywheel in a single direction to provide useful power.