What's the round thingy,..??

Bondo

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In the 1st scene in this video, there's a round thingy on one of this ship's windshields,.......
What is it,..??
 

alldodge

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Clear View Screen
 

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Bondo

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Ok,..... So how does it provide a Clear View,..??
Is it like a windshield wiper,..?? Does it spin a wiper blade,..??
Does it work like a defroster,..??
 

alldodge

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The window spins to disperse water and can also be heated

WIKI has best description
 

briangcc

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They're used on our machine tools. DMG 160/210. Clears cutting fluid from the viewing windows.
 

QBhoy

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Yeah. Constantly rotates and doesn’t allow water to sit, obstructing view. Found commonly on commercial spec boats over the decades gone by. Pilot boats mostly all have these.
 
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