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[2000]

What's the circular thing on the window.

[VirtualSkipper]

It's a clear view screen. During a storm at sea, the disc spins at a high rate, flinging the water out to the edges and providing a clear field of vision. And it means that no one has to go out on deck to replace wiper blades during the storm.

http://en.wikipedia.org/wiki/Clear_view_screen

[vin_sun]

VS has said it all. On ships we call it the 'Clear View Screen'. In the centre is a high speed motor on to which the glass disc is attached. Pretty effective when heavy rain is hitting the porthole glass and the traditional wipers cannot cope up. A close up picture below.

[VirtualSkipper]

You can also see it on this tram here.



Around is covered in snow, but not inside the ring.   

[2000]

ok