This improvement consists in part, in the arrangement of two sets of
levers and hand poles on each side, in such a manner that "when force
is applied to the hand-poles of the outside levers, in a reverse
direction to that which is applied to the hand poles of the inside
levers, both powers will agree in forcing the pistons of the pumps in
one and the same direction, while the reverse motion of the levers
will prevent the engine from rocking". Entered at the Patent Office, on
the 10th instant, by Barton & Button.
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