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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〔 ("Revolving Disk on Windshield Keeps Off Sleet and Rain" ''Popular Mechanics'', December 1934 ) bottom-left of pg 873〕 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.〔Shooting the storm sequence through a Clearview screen http://ecx.images-amazon.com/images/I/51M9EPHPPWL._SS500_.jpg〕 File:Rotating windshield wiper.jpg|Detail image from inside of a clear view screen on R/V ''Knorr'' File:JNR DD51 111.JPG|A clear view screen of the Type DD51 diesel locomotive in Hokkaidō, Japan File:Sapporo Tram Type Yuki 10 001.JPG|''Sasara Trams'' of Sapporo Streetcar are equipped with clear view screens == References and Notes == 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Clear view screen」の詳細全文を読む スポンサード リンク
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