.MzIzNjc.MTExNDA2

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Windage

[Drawing of a circle with a cross through it] [At 12 o'clock] 40 [under that] 0 [At 3 o'clock] 10 [At 6 o'clock] 20 [At 9 o'clock] 30

Center of circle is the location of guns 0 or 40 is location of target

[an arrow is drawn to the line near the 10] it is labelled WX (Rn) [an arrow is drawn to the line near the 20] it is labelled WZ (Def)

Guns R X = L-B guns L X = L + B

L -= D tan X

      ______ 
        G T (kil)

W = D sin x

     ___________
       GT kil.