, while ally from being directly fore and. aft when far- vessels, a system which is both new and ingenious. by turning the shaft through 180 degrees the motion thest a-port and farthest a-starboard to being most If an inventor should try to imitate artificially the of the vessel can be reversed.… … ance with the law of harmonic mo- propeller was greater than the screw SHOWING SHAFT. tion. When these propellers of nature propeller, and that the maneuvering oscillate, they communicate lateral as ability was greater than attainable by weil as sternward velocity to the water, but a subse- rection…
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