This 1922 US Navy ordnance publication covers the Deflection Converter Mark I and Mark I Mod. I, a fire control instrument used in conjunction with the Ford Rangekeeper secondary battery system (see OP 460 — Ford Rangekeeper Mk. II, 1922). The Deflection Converter computed the lateral deflection angle needed to correct for target motion, allowing gun crews to lead a moving target accurately. The instrument was a key component of the integrated Ford fire control suite fitted to US Navy warships in the early twentieth century.
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