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CHAPTER 1 INTRODUCTION - TM-9-1240-322-34-P0051
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TM-9-1240-322-34-P Sight Infinity: 8635466 (1240-00-056-4854) Manual
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Figure - TM-9-1240-322-34-P0053
TM 9-1240-322-34&P
Section 2. DESCRIPTION AND DATA
1-3.
DESCRIPTION
Infinity Sight 8635466 is used to project a lighted reticle image into periscope M32 and periscope M35, in
the fire control system of the M60, M60A1, and M728 tanks. The reticle image is used as a sighting
reference for a machine gun. The infinity sights' mounting surface attaches to the front of the Periscope
Mount M118.
The optical system is contained within the base housing (1) and includes a reticle, a lens assembly, and a
window (2) sealed in position to keep the infinity sight protected against dirt, dust, and moisture.
The boresight system is contained within the base housing (1). Rotation of the azimuth and elevation
boresight knobs (3) causes the reticle to be adjusted in deflection and elevation.
The lighting system has a lamp assembly (4), a toggle switch (5), and a variable resistor (6). The lamp
assembly (4) shines light on the reticle. The toggle switch (5) turns the power to the lamp assembly (4)
on or off. The variable resistor (6) varies the power to the lamp assembly (4). Turning the variable
resistor clockwise turns the lamp on and increases the amount of light on the reticle. Turning the variable
resistor (6) counterclockwise decreases the amount of ligh on the reticle and turns the lamp off.
1-2
Vol II

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