The Course Setting Bomb Sight, Mk IXA, was used in British RAF and Royal Navy and RCAF bombers during WW2, such as the Short Stirling and Avro Lancaster. The Course Setting Bomb Sight (CSBS) is the canonical vector bombsight, the first practical system for properly accounting for the effects of wind when dropping bombs. It is also widely referred to as the Wimperis sight after its inventor, Harry Wimperis. This particular sight has a serial number which indicates its date of manufacture: 1936.
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