EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES

TM 9-1240-375-34&P

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EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES - Continued

M138/M138A1 Elbow Telescope: The elbow telescope is an 8-power, 8-degree field of view instrument. A

self-illuminated elevation reticle is provided for direct fire. The M138/M138A1 telescope also has a mil scale

reticle that is inscribed in meters for range and is self-illuminated. The M138 is illuminated by tritium H3

and the M138A1 is illuminated by lithium batteries.

The optical system is composed of the following:

A two-component objective lens system

An amici prism

A flat reticle

A reticle lens

A field lens

A center lens

An eye lens

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