TM 9-1240-400-34&P
b. M138 Telescope Mount.
(1) Support Assembly. The support assembly consists of an eyebolt assembly and a telescope clamp to hold the
M139 elbow telescope in place.
(2) Bracket Assembly. The bracket assembly contains the electrical system. A variable resistor adjustment knob
controls the various settings for illumination. A receptacle is provided for connection of a 24-volt dc power source for the
instrument light.
(3) Adapter. The adapter contains a deflection adjusting cam and an elevation adjustment worm for adjustments in
deflection and elevation. An elevation locking lever provides for adjustment at the desired setting in elevation.
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