Clear view screen

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", "Kent Screen" and "rotating windshield wiper".

Clear view screens were patented in 1917 by Samuel Augustine de Normanville and Leslie Harcourt Kent as a stand-alone pillar-mounted screen,[1] 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.

The technology was then acquired by BAE Marine Works to produce clear view screens for military applications.