Tom blok Photo collection by Th.Schiöler River and wind powered Dragon-bone chains Photo 72
Dragon-bone chains
Gul streg
Photo 511 x 506 pixels, 43,6 K
 
The propeller can be turned nearly 360º round the post
In many parts of the tropics the wind direction does not alternate during the year, so there is no need for a windvane.
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