Section VI. BINOCULARS

TM 9-258

Section VI. BINOCULARS

vision and to provide a compact instrument (fig 8-21).

8-18. General.

The optical axis of each scope must be parallel to the

a. A military binocular or field glass consists of

hinge throughout the entire movement of the

two terrestrial prism offset-type telescopes pivoted

interpupillary range; otherwise each eye will see a

about a hinge which provides adjustment for

different field resulting in a double image, if deviation is

interpupillary distance for use with both eyes. The left

great, and headache will result from eyestrain in bringing

telescope of many models contains a reticle (H and I, fig

the two fields into coincidence.

4-25). An erecting system is required in each of the

halves of the instrument; prisms are used as erectors to

increase stereoscopic

8-16