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The Möhne, the Eder and the Sorpe.
Barnes and Molly Wallis in 1925. (Estate of Mary Stopes-Roe)
The Wallis home in Effingham, Surrey. (Cambridge University Library/MS Vickers)
Wallis in his study with an assistant. (Cambridge University Library/MS Vickers)
1940 cartoon showing the Wallis-designed Wellington bomber.
The scaled-down model of the Möhne at Nant-y-Gro in Powys, eight minutes after a test explosion in 1942. (The National Archives/AVIA 10/369)
Recording apparatus attached to scale-model dam at Watford. (The National Archives/DSIR 27/43)
Test explosion at Nant-y-Gro. (The National Archives/AVIA 10/369)
Cherwell, Portal, Pound and Churchill watching a display of anti-aircraft gunnery, June 1941. (Imperial War Museum/H 10306)
Air Vice Marshal the Hon. R.A. Cochrane. (Imperial War Museum/CH 14564); Sir Charles Craven. (Cambridge University Library/MS Vickers); Sir Norman Bottomley. (National Portrait Gallery, London/Howard Coster); Arthur Collins; Air Marshal Sir John Linnell. (Imperial War Museum/CM 5259); Gp. Capt. F. W. Winterbotham. (Barry James Gilmore/Fairfax Media/Getty Images)
Air Chief Marshal Sir Arthur Harris. (Imperial War Museum/CH 13020)
Harris with his wife Jill and daughter Jackie. (Leonard McCombe/Picture Post/Getty Images)
Avro Lancaster
