MARTIN BOND / SCIENCE PHOTO LIBRARY MARTIN BOND / SCIENCE PHOTO LIBRARY
Windmill. View of a spinning windmill. The large yellow disc (centre right) is a vane, which acts like a rudder, keeping the windmill pointing in the optimum direction to the wind. This type of many-bladed windmill is commonly used as a water pump, with the rotor attached to a gear system and a piston pump. Photographed in Yorkshire, England.
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