MARTIN BOND / SCIENCE PHOTO LIBRARY MARTIN BOND / SCIENCE PHOTO LIBRARY
Worm gear. Rusty worm gear on the sluice gate of a water mill. The gear consists of a toothed wheel (lower frame) which is worked by a short, revolving cylinder (upper centre) known as the worm. This type of gear transmits power between perpendicular shafts. Photographed near Fiddleford in Dorset, England.
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