US Army, Technical Manual, TM 9-1290-262-10, OPERATOR'S MANUAL AIMING CIRCLE M2 W/E, (1290-00-314-0008), AND M2A2 W/E, (1290-01-067-0687), 2002

US Army, Technical Manual, TM 9-1290-262-10, OPERATOR’S MANUAL AIMING CIRCLE M2 W/E, (1290-00-314-0008), AND M2A2 W/E, (1290-01-067-0687), 2002


FACTS ABOUT YOUR M2 AND M2A2
AIMING CIRCLE
Your aiming circle is used to measure azimuth and elevation angles of a ground or
aerial target with respect to a preselected base line.
Let’s compare the M2 and M2A2 Aiming Circle:

M2
Weight, aiming circle w/cover . . . . . . . . . . 9 lb
Weight, aiming circle w/equipment . . . 21 lb
Azimuth rotation . . . . . . . . . . . . . . . . . . unlimited
Elevation (maximum) . . . . . . . . . . . . . . . . . . . . . 800 mils
Depression (maximum) . . . . . . . . . . . . . . . . . 400 mils
Telescope power . . . . . . . . . . . . . . . . . 4 power
Field of view . . . . . . . . . . . . . . . . . . . . . 10 degrees



FACTS ABOUT YOUR M2 AND M2A2 AIMING CIRCLE 2
EXTERNAL PARTS AND WHERE TO FIND THEM 6
LEVELING CONTROLS AND WHERE TO FIND THEM 12
AZIMUTH CONTROLS AND WHERE TO FIND THEM 14
ELEVATION CONTROLS AND WHERE TO FIND THEM 18
ELBOW TELESCOPE PARTS AND WHERE TO FIND THEM 22
MAGNETIC COMPASS CONTROLS AND WHERE TO FIND THEM 24
DATA PLATE AND NOTATION PAD 27
EQUIPMENT USED WITH YOUR M2 OR M2A2 AIMING CIRCLE 28
SOME HANDLING DOs AND DON'TS FOR
YOUR M2 OR M2A2 AIMING CIRCLE 32
SETTING UP YOUR M2 OR M2A2 AIMING CIRCLE 34
Emplacing the Tripod 34
Putting the Aiming Circle on the Tripoid 38
Positioning the Aiming Circle over an Orienting Station 41
Leveling the Aiming Circle
PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) . . 48
OPERATION UNDER USUAL CONDITIONS FOR M2 OR M2A2
AIMING CIRCLE 54
Measuring Horizontal Angles 54
Orientation on a Point of Known Azimuth 58
Measuring Vertical Angles 59
Orientation on Grid North 60
Declination Procedures 61
TAKING DOWN YOUR M2 OR M2A2 AIMING CIRCLE 62
OPERATION UNDER UNUSUAL CONDITIONS FOR
M2 OR M2A2 AIMING CIRCLE 66
Extreme Cold 66
Hot Climates 68
Dusty and Sandy Areas 69
Wet and Salty Areas 69
PARTS YOU REPLACE ON YOUR M2 OR M2A2 AIMING CIRCLE 70
COMPONENTS OF END ITEM AND BASIC ISSUE ITEMS LIST 73
Components of End Item 73
Basic Issue Items 76
ADDITIONAL AUTHORIZATION LIST 78
EXPENDABLE SUPPLIES AND MATERIALS LIST 78