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Operation Crossbow : 3D glasses against Hitler

Newly released photographs show how a team of World War II experts disrupted Nazi plans to bombard Britain - with the help of 3D glasses like those in modern cinemas. Their secret weapon was a stereoscope - a simple Victorian invention which brought the enemy landscape into 3D. Working on the same principles as modern-day 3D glasses, it allowed the PIs to measure height, especially of unidentified new structures - such as rockets and their launch sites.

From UK, you may watch the documentary on the BBC Player until Tuesday 24 May 2011. The last broadcast is on Tuesday23:20 on BBC Two.

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Much of the aerial photography featured in Operation Crossbow was discovered through the research of Allan Williams, curator of The National Collection of Aerial Photography, part of RCAHMS. While the collection contains millions of images, only a small percentage have so far been digitised and catalogued - but Williams says they tell the story of one of the war's most decisive episodes. "The British always used 3D and the Germans didn't," he says. "What this meant was that the British could make enemy territory come to life.

Read the full story of Operation Crossbow on the BBC web. This paper includes a video excerpt of a BBC documentary about Operation Crossbow ( Operation Crossbow was on BBC Two at 9pm from Sunday May 15, 2011 to Tueasdy May 24, 2011 ).