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BINOCULAR:M13 and M13A1

BINOCULAR:M13 and M13A1


Model
M3, w/e      Line item No.       Federal stock No.
M13, w/e----------------------4-01248-40----------------6650-670-2508
M13A, w/e--------------------4-01248-50----------------6650-530-0973

General
BINOCULAR:M13 and M13A1, consists of two prismatic telescopes pivoted about a common hinge so as to permit adjustment of the distance between the eyepieces(interpupillary distance). The binocular hinge is equipped with a scale which indicates shis distance in millimeters. The hinge holds the axes of the two telescopes in parallel alinement. The prism system in each telescope erects the image and provides an offset line of sight which increases stereoscopic vision. The prism system also increases the effective optical length of the two telescopes without increasign their actual size. Each eyepiece can be focused independently of the other by turning the diopter scale in a plus or minus direction, providing the correction required for the corresponding eye.
These binoculars are used for observation and have a reticle in the left eyepiece identical to that of BINOCULAR:M3, for approximate measurement of small angles.

differences among models
The M13 and M13A1 are identical with the exception that the waterproofing of the M13A1 has been improved over the waterproof-ing of the M13.

data plate location
Model number, magnification, and diameter of the objectives are shown on the cover of the left eyepiece assembly.

Classification
M13----------------------Standard B(OTCM 36841)
M13A1------------------Standard B(OTCM 36841)

CHARACTERISTICS
Magnification.................................................. 6 power
Aperture........................................................... 30-mm
Field of view.................................................... 8 deg. 30 min
Exit pupil.......................................................... 0.197 in.
“F” number of objective................................ F/4.4
Reticle horizontal scale................................. 50-0-50 mils
Reticle range scale........................................ 0 to 2,000 yd
Filter.................................................................. M1


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