Fitch’s first boat employed a system of paddles suspended by their handles from cranks, which, in revolving, gave the paddles a motion simulating that which the Indian imparts to his paddle. Edward W. Byrn.十九世纪发明进展.
A curved eye-pointed needle was carried at the end of a pendent vibrating lever, which had a motion simulating that of a pick-ax in the hands of a workman. Edward W. Byrn.十九世纪发明进展.