Buoyancy motor #1
John Phin describes this one in his classic book Seven Follies of
Science (Van Nostrand, 1906), attributing it to a correspondent named
"Power".
A J-shaped tube A, Fig. 14, is open at both ends but tapers at the lower
end, as shown. A well-greased cotton rope C passes over the wheel B and through
the small opening of the tube with little or no friction, and also without
leakage. The tube is then filled with water. The rope above the line WX
balances over the pulley, and so does that below the line YZ. The rope in the
tube between these lines is lifted by the water, while the rope on the other
side of the pulley between these lines is pulled downward by gravity.
Phin says that the "inventor offers this device as a kind of puzzle
rather than as a sober attempt to solve the famous problem," and Phin
concludes by asking why it will not work.
Source: https://www.lhup.edu/~dsimanek/museum/unwork.htm#buoy1
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