The Use of the Mil Scale in Military Mapping
The Bausch and Lomb six-power stereo prism binocular glass. -This glass is equipped with individual focusing attachment, and on the hinge separating the optical axes of the two eyepieces is a graduation in millimeters giving the distance between these two axes. The left half of the glass is equipped with two scales set at right angles to each other. The vertical one, known as the corrector scale, is used chiefly in problems of firing with an auxiliary aiming point, and the horizontal one, called the mil scale, in the measurement of vertical and horizontal "fronts."
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