What is "clear view screen"

n. (context nautical English) a circular disc of plate glass, set into the screen of a ship's bridge and spun at high speed by an electric motor in heavy rain or snow; it offers a clear view forward

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. Many fishermen call them a "clear sight.

Clear view screens were originally developed in the mid-1930s for automobiles as a better option than standard windshield wipers but were soon found more suitable for small boats and larger ships. On ships, a clear view screen is usually on the bridge and rotates at high speed (~1500 rpm). Clear view screens are also used in locomotives and rail transport.

A clear view screen was utilised in filming the storm sequence of the movie Ryan's Daughter.

windshield wiper.jpg|Detail image from inside of a clear view screen on R/V Knorr DD51 111.JPG|A clear view screen of the Type DD51 diesel locomotive in Hokkaidō, Japan Tram Type Yuki 10 001.JPG|Sasara Trams of Sapporo Streetcar are equipped with clear view screens