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BNPS.co.uk (01202) 558833. <br />
Pic: Cuttlestones/BNPS<br />
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Pictured: The ticket for the reunion where F/Sgt Scott was given the drawing. <br />
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A rare sketch by Barnes Wallis showing how his famous bouncing bomb worked has been unearthed.<br />
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The genius scientist made the pencil drawing on a ticket during an RAF Halton alumni reunion in south west London in 1946.<br />
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At the event, Wallis was asked to explain how his explosive device skimmed across the water by Flight Sergeant Scott. He decided the best way to demonstrate it was through a diagram, so he looked for something to draw on.<br />
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F/Sgt Scott handed him his admission ticket and Wallis made a 5ins by 3.5ins sketch which he signed with his initials BW.<br />
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The sketch, which is in a frame with a photo of Wallis, is expected to fetch £1,200 when it is sold with Cuttlestones Auctioneers, of Wolverhampton.