From outside to inside scales:
most outer scale : real (mast)height for range, or real (ship)length for AOB
outer scale of moveable wheel: range only (number times 100 meters)
inside scale of moveable wheel: optical height or (halve?) length as observed in the scope.
most inner scale: AOB scale, 90 degrees is index to which observed height should be aligned for range measurement in 6x zoom.
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