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As bomber aircraft began flying higher and faster during the First World War and the interwar period, it became necessary to develop sophisticated mechanical bombsights to help maintain bombing accuracy. 

The two most common bombsights used by the Royal Air Force during WWII were the Mk.IX Course-Setting Bombsight (CSBS) and the Mk.XIV sight, which worked on the vector principle - distinct from the tachometric principle used by the more famous U.S. Norden bombsight.

Mk. IX Bombsight Tutorial: https://www.youtube.com/watch?v=L0GH8bmW59I

Norden Bombsight Training Films:

https://www.youtube.com/watch?v=143vi97a4tY
https://www.youtube.com/watch?v=Rbtmb_JrX2g&t=361s
https://www.youtube.com/watch?v=VHeL-TitKuo
https://www.youtube.com/watch?v=7MIE_XXmGUg
https://www.youtube.com/watch?v=rAYRv8T5jEg&t=344s