This 1922 revised edition of US Navy ordnance publication OP 460 covers the Ford Rangekeeper Mark II secondary battery fire control computer. The 1922 revision updates and supersedes the 1917 edition, incorporating changes made during World War I service experience. The Ford Rangekeeper Mk. II — the “Baby Ford” — used a single integrator to compute range and bearing for secondary gun batteries. Original page 6 of this document was blank and is not reproduced.
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