I actualy got to sit at one of those stations, althought it was the one the bombader used, It was in FiFi at an airshow, acording to the B 29 vet giving the tour,the sight was coupled to a computer located in the back of the plane the computer did all the math, so what you did was aim the sight at the target and adjust a couple bars in the reflector sight to bracket your target this would establish the range and the computer would autamaticaly provide the right amount of lead on the target.