This is London's only public Camera Obscura, and though it was only installed in 1994, it is the latest in a line of such devices at the Observatory. Using a lens and rotating mirror to project a real-time image of the outside world, it presents a panorama of one of London's most celebrated views, showing Greenwich, the Thames, the National Maritime Museum and the Royal Naval College.
The Observatory is open daily, but your author recommends that readers make their visit today or tomorrow, as the £10 fine for being interested in science comes into force on Tuesday. For more information, see http://www.nmm.ac.uk/visit/exhibitions/on-display/the-camera-obscura
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