Useful device
A homemade plane made of wood on the pole.
The body of the aircraft rotates about the vertical axis. At the plane the propeller also rotates.
With this simple device, the direction and speed of the wind are measured. These planes are in many village yards.
Canon 50d, 70-300mm
Velikiy Ustyug, Russia
World of Photography
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Thanks for sharing this photography is very nice post