The piston moves about three feet, and each
vibration of it gives the axis about forty revolutions. Each revolution
of the axis moves twelve oars or paddles five and a half feet: they work
perpendicularly, and are represented by the strokes of a paddle of a
canoe. As six of the paddles are raised from the water, six more are
entered, and the two sets of paddles make their strokes of about eleven
feet in each revolution. The crank of the axis acts upon the paddles
about one-third of their length from their lower ends, on which part of
the oar the whole force of the axis is applied. The engine is placed in
the bottom of the boat, about one-third from the stern, and both the
action and reaction turn the wheel the same way."
Fitch was unfortunate in his affairs, and became so disheartened that
he ceased to attempt to improve his invention, and finally committed
suicide by drowning himself in the Alleghany River at Pittsburgh.
In 1787, Mr. Patrick Miller, of Dalwinston, Scotland, designed a double
vessel, propelled by a wheel placed in the stern between the two keels.
This boat is said to have been very successful, but it was very small,
the cylinder being only four inches in diameter.
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