Patent:GB274526

"Gunnery calculators. - Anti-aircraft fire-control apparatus, for determining the angle at which a gun should be aimed to hit a moving aerial target is designed so that the air is taken as the datum of reference the angles of elevation and bearing appropriate to a virtual future position of the target due to its air speed, assuming there is no wind and neglecting the speed of the gun, being first calculated, and corrections to compensate for the deflections due to the gun speed relatively to the air being then superimposed on these predicted angles. ..."

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