TM-9-1240-400-34&P Technical Manual for M109 Telescopes and Mounts Download
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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. 1-5