The wiper mechanism comprises an arm, usually of metal, holding a rubber blade. A small motor moves the wiper back and forth in a pendulum motion.

A clear view screen or clearview screen is a glass disk mounted in a window that rotates to disperse rain, spray, and snow. A clear view screen is typically driven by an electric motor at the center of the disk, and is often heated to prevent condensation or icing. Other common names for it include "clear sight", "spin window" and "rotating windshield wiper".

Clear view screens were patented in 1917 by Samuel Augustine de Normanville and Leslie Harcourt Kent as a standalone pillarmounted screen, with later patents for telescope and optics covers, followed by the more familiar ships bridge glass. Clear view screens are also used in locomotives and rail transport and were unsuccessfully marketed for automobiles. They were initially manufactured by George Kent Ltd, a firm began by Leslie Kent’s grandfather, and of which, Leslie Kent later was a director.

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