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Course Setting Bomb Sight
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<p>The Course Setting Bomb Sight (CSBS) is the canonical <i>vector</i> <a href="/facts/Bombsight/g2YSykBq">bombsight</a>, 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, <a href="/facts/Harry_Wimperis/xCwRGe0w">Harry Wimperis</a>. </p><p>The CSBS was developed for the <a href="/facts/Royal_Naval_Air_Service/SNATPNh0">Royal Naval Air Service</a> (RNAS) in order to attack <a href="/facts/Submarine/6fhcAKHV">submarines</a> and <a href="/facts/Ship/418ptx1L">ships</a>. It was introduced in 1917, and was such a great advance over earlier designs that it was quickly adopted by the <a href="/facts/Royal_Flying_Corps/jM7cHmvR">Royal Flying Corps</a>, and the <a href="/facts/Independent_Air_Force/LCUNxCEU">Independent Air Force</a>. It has been called "the most important bomb sight of the war". </p><p>After the war the design found widespread use around the world. A US version of the CSBS was used by <a href="/facts/Billy_Mitchell/S9bY3W69">Billy Mitchell</a> on his famous attack on the <a href="/facts/SMS_Ostfriesland/ePztm587"><i>Ostfriesland</i></a> in <a href="/facts/SMS_Ostfriesland/ePztm587">1921</a>. The basic design was adapted by almost all air forces and used well into <a href="/facts/World_War_II/2efV5L1U">World War II</a>. It was eventually replaced in British service by more advanced designs like the <a href="/facts/Mark_XIV_bomb_sight/18LH4tKV">Mark XIV bomb sight</a> and the <a href="/facts/Stabilized_Automatic_Bomb_Sight/s4lS8w28">Stabilized Automatic Bomb Sight</a>. Other services used vector bombsights throughout the war. </p>