Derwisch
The object consists of two identical parts mounted in bilateral symmetry. Two discs pivoted on an horizontal axis touch in one point thus rotating contrariously. a rod is supported in its ends by axes that are bedded each excentrically on one of the discs. In the middle of the rod perpendicular to the two discs a semicircle is fixed. This semicircle is pushed up or down by the wind depending on its angle. The rod and its excentrical beddings transmit the movement to the two discs where it is converted to rotation. since the whole system is twofold, slack points can be eliminated by phase shift. A fin turns the whole object into the wind.See also: 
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