Correction for drift caused by the adoption of rifling in big guns was approximated by inclination of the rear sight bracket.
并且靠稍微偏移后瞄准座来修正大型火炮因膛线所带来的偏流。
2
The sight telescope was mounted in such a way that the line of sight could be offset from the axis of the bore of the gun to correct for range, drift, and relative motion of gun and target.