Clear view screen

Two clear view screens on the navigation bridge of a tugboat

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.

Clear view screens were originally developed in the mid-1930s for automobiles as a better option than standard windshield wipers^[1] 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.^[2]

Detail image from inside of a clear view screen on R/V Knorr
A clear view screen of the Type DD51 diesel locomotive in Hokkaidō, Japan
Sasara Trams of Sapporo Streetcar are equipped with clear view screens

References and Notes

↑ "Revolving Disk on Windshield Keeps Off Sleet and Rain" Popular Mechanics, December 1934 bottom-left of pg 873
↑ Shooting the storm sequence through a Clearview screen http://ecx.images-amazon.com/images/I/51M9EPHPPWL._SS500_.jpg

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