An invention from Euler

(With permission from Euler to reprinted. See my comment below.)

The problem of this invention is that fan itself doesn’t consumption too much energy. The amount of energy saved would be unnoticeable to these country where oil and electricity is cheap. Moreover, unless we close the spiral axis, otherwise the direction of rotation of the leaves would changed periodically so angular momentum is not preserved. This invention’s extra energy is coming from gravity using the principle from here.

~ 由 newnewhkcc1976 於 18 五月, 2008.

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