The Kerrison Predictor was one of the first fully automated anti-aircraft fire-control systems. It was used to automate the aiming of the British Army's Bofors 40 mm guns and provide accurate lead cal
The Singer M5 was the US version of the Kerrison Predictor. The sighting telescope is near the top, with the elevation handwheel below it and the range handwheel at the right. A second telescope is on the opposite side, not visible here, along with the azimuth handwheel.