Title: TUBE LEVELS. KNOB COVER. ORIENTING KNOB. NOTATION PAD. USMC
1 WELCOME TO THE M2A2 AIMING CIRCLE
2FOUR MAJOR PARTS OF AN AIMING CIRCLE
TELESCOPE ASSEMBLY
BODY ASSEMBLY
WORM GEAR HOUSING
BASE PLATE ASSEMBLY
3COMPONENTS OF THE M2 AIMING CIRCLE
AIMING CIRCLE COVER
STRAP
CATCH ASSEMBLY
BASE PLATE
BASE PLATE COVER
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6M24 TRIPOD
LEG STRAP
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8ACCESSORY KIT
CANVAS COVER
BACK PLATE
INSTRUMENT LIGHT
BULB EXTRACTOR PLUMB BOB
9SETTING UP THE TRIPOD
10- UNSTRAP THE LEGS OF THE TRIPOD
- LOOSEN THE LEG CLAMP THUMBSCREWS AND EXTEND THE
LEGS TO THE APPROX. SHOULDER HEIGHT - TIGHTEN THE LEG CLAMP THUMBSCREWS
11- PLACE THE TRIPOD OVER THE POINT TO BE OCCUPIED,
WITH ONE TRIPOD LEG BISECTING THE AREA OF
INTEREST - ROUGH LEVEL THE TRIPOD BY LOOKING OVER THE TOP
OF THE TRIPOD HEAD - FIRMLY PRESS EACH LEG INTO THE DECK WITH YOUR
BOOT
12ATTACH THE AIMING CIRCLE TO TRIPOD
- PULL BACK THE SPRING-LOADED COVER ON THE BASE OF
THE BASE PLATE, AND PLACE THE AIMING CIRCLE ON
THE TRIPOD. LOOSELY SCREW THE INSTRUMENT-FIXING
SCREW INTO THE BASE PLATE. - CENTER THE PLUMB BOB OVER THE ORIENTING STATION
BY MOVING THE BASE PLATE OF THE AIMING CIRCLE.
THE PLUMB BOB SHOULD BE APPROXIMATELY 1 INCH
ABOVE THE STATION MARKER. - TIGHTEN THE INSTRUMENT-FIXING SCREW INTO THE BASE
PLATE OF THE AIMING CIRCLE, AND REMOVE THE PLUMB
BOB
13-CAUTION- DO NOT OVERTIGHTEN THE INSTRUMENT
FIXING SCREW OR THE SLOTTED ARM WILL DAMAGE THE
THREADS IN THE TRIPOD HEAD
14- REMOVE THE AIMING CIRCLE HEAD COVER, AND HANG IT
ON THE TRIPOD HEAD COVER TO PREVENT DAMAGE
15LEVELING THE AIMING CIRCLE
16- ADJUST LEVELING SCREWS SO YOU CAN SEE 3/8 TO
1/2 INCH OF THREAD - UNCOVER THE LEVELING VILE
- PULL THE AZIMUTH MICROMETER KNOB SLIGHTLY TO
THE REAR TO RELEASE THE LOCK AND ROTATE THE
AIMING CIRCLE UNTIL THE LEVELING VILE IS PARALLEL
TO ANY 2 OF THE LEVELING SCREWS - ENSURE THE GEARS LOCK
17- TO LEVEL THE BUBBLE IN THE FIRST POSITION, TURN
BOTH SCREWS AT THE SAME TIME EITHER TOWARD EACH
OTHER, OR AWAY FORM EACH OTHER UNTIL THE BUBBLE
MOVES TO THE CENTER. - THE BUBBLE MOVES IN THE SAME DIRECTION AS YOUR
LEFT THUMB
OR
181. MOVE TO THE SECOND LEVELING POSITION, TURN
THE AIMING CIRCLE HEAD SO THAT LEVELING VILE IS
AT A RIGHT ANGLE TO THE FIRST POSITION 2. TO
CENTER THE BUBBLE IN THE SECOND POSITION, USE
ONLY THE REMAINING LEVELING SCREW 3. GO BACK AND
FORTH BETWEEN POSITIONS MAKING FINE ADJUSTMENTS
UNTIL THE BUBBLE REMAINS CENTERED IN BOTH
POSITIONS
19MEASURING HORIZONTAL ANGLES
20HORIZONTAL ANGLES SETUP ON REAR STATION
- SET ALL SCALES TO ZERO
- OPEN ORIENTING KNOB COVERS, PULL KNOB BACK
SLIGHTLY TO RELEASE THE LOCK - ROTATE THE CIRCLE HEAD SO THAT IT IS POINTED
JUST LEFT OF THE REAR STATION, RELEASE THE
ORIENTING KNOB AND INSURE THAT IT LOCKS INTO
POSITION
21- LOOK THROUGH THE TELESCOPE AND TURN THE
ORIENTING KNOBS TOWARD YOU TO BRING THE VERTICAL
CROSSHAIR TO THE CENTER OF THE REAR STATION. THE
LAST MOTION SHOULD BE FROM LEFT TO RIGHT. CLOSE
THE COVERS ON THE ORIENTING KNOBS - TURN THE ELEVATION MICROMETER UNTIL THE
HORIZONTAL CROSSHAIR IS AT THE LOWEST VISIBLE
POINT ON THE REAR STATION.
221. PULL THE AZIMUTH MICROMETER KNOB SLIGHTLY TO
THE REAR, ROTATE THE AIMING CIRCLE TO BRING THE
VERTICAL CROSSHAIR JUST LEFT OF THE FORWARD
STATION. ROTATE THE AZIMUTH MICROMETER CLOCKWISE
UNTIL IT LOCKS INTO POSITION. 2. TURN THE
ELEVATION MICROMETER UNTIL THE HORIZONTAL
CROSSHAIR IS AT THE LOWEST VISIBLE POINT OF THE
FORWARD STATION. 3. TURN THE AZIMUTH MICROMETER
KNOB CLOCKWISE UNTIL THE VERTICAL CROSSHAIR IS
CENTERED ON THE FORWARD STATION. YOUR LAST
MOTION IS FROM LEFT TO RIGHT.
23READ AND RECORD THE HORIZONTAL ANGLE
1. TO DETERMINE THE HORIZONTAL ANGLE, FIRST READ
THE AZIMUTH SCALE. EACH MARK IS 100 MILS. 2.
THEN READ THE AZIMUTH MICROMETER SCALE. EACH
MARK IS ONE MIL. COMBINE THE READINGS TO GET THE
HORIZONTAL ANGLE. FOR EXAMPLE, THIS READING IS
0655.5 MILS. WHEN YOU MEASURE, ROUND OFF TO THE
NEAREST ½ MIL. RECORD THIS READING.
24HORIZONTAL ANGLES TURN CHECK ANGLE
1. LEAVE FIRST ANGLE ON AZIMUTH SCALES 2. OPEN
ORIENTING KNOB COVERS, PULL ORIENTING KNOB BACK
SLIGHTLY TO RELEASE THE LOCK 3. ROTATE THE
AIMING CIRCLE HEAD SO THAT THE AIMING CIRCLE IS
POINTED JUST LEFT OF THE REAR STATION, RELEASE
THE ORIENTING KNOB AND INSURE THAT IT LOCKS INTO
POSITION
25HORIZONTAL ANGLES SETUP ON REAR STATION
1. LOOK THROUGH THE TELESCOPE AND TURN THE
ORIENTING KNOBS TOWARD YOU TO BRING THE VERTICAL
CROSSHAIR TO THE CENTER OF THE REAR STATION.
YOUR LAST MOTION SHOULD BE FROM LEFT TO RIGHT.
CLOSE THE COVERS ON THE ORIENTING KNOBS 2. TURN
THE ELEVATION MICROMETER UNTIL THE HORIZONTAL
CROSSHAIR IS AT THE LOWEST VISIBLE POINT ON THE
REAR STATION
26HORIZONTAL ANGLE TURN CHECK ANGLE
1. PULL THE AZIMUTH MICROMETER KNOB SLIGHTLY TO
THE REAR, ROTATE THE AIMING CIRCLE TO BRING THE
VERTICAL CROSSHAIR JUST LEFT OF THE FORWARD
STATION. ROTATE THE AZIMUTH MICROMETER CLOCKWISE
UNTIL IT LOCKS INTO POSITION. 2. TURN THE
ELEVATION MICROMETER UNTIL THE HORIZONTAL
CROSSHAIR IS AT THE LOWEST VISIBLE OF THE FORWARD
STATION. 3. TURN THE AZIMUTH MICROMETER KNOB
CLOCKWISE UNTIL THE VERTICAL CROSSHAIR IS
CENTERED ON THE FORWARD STATION. YOUR LAST
MOTION IS FROM LEFT TO RIGHT.
27READ AND RECORD THE CHECK ANGLE
- TO DETERMINE THE HORIZONTAL ANGLE, FIRST READ THE
AZIMUTH SCALE. EACH MARK IS 100 MILS - THEN READ THE AZIMUTH MICROMETER SCALE. EACH
MARK IS ONE (1) MIL. COMBINE THE READINGS TO GET
THE HORIZONTAL ANGLE - EXAMPLE THIS READING IS 0655.5 MILS. WHEN YOU
MEASURE, ROUND OFF TO THE NEAREST ½ MIL. - RECORD THIS READING
28DETERMINE THE MEAN ANGLE
HORIZONTAL ANGLE 0862.0 CHECK ANGLE
1724.0
- CHECK ANGLE DIVIDED BY 2 MUST AGREE WITH
HORIZONTAL ANGLE WITHIN ½ A MIL - IF NOT, START OVER AND TURN THE ANGLE AGAIN
- IF THE CHECK ANGLE IS LESS THAN THE HORIZONTAL
ANGLE, ADD 6400 AND THEN DIVIDE BY 2
29MEASURING VERTICAL ANGLES
301
1. TO DETERMINE THE VERTICAL ANGLE, FIRST READ
THE ELEVATION SCALE. EACH NUMBER IS 100 MILS. THE
BLACK NUMBERS ARE POSITIVE (), THE RED NUMBERS
ARE NEGATIVE (-). 2. THEN, READ THE ELEVATION
MICROMETER SCALE. EACH MARK IS ONE MIL. COMBINE
THE READINGS TO GET THE FIRST VERTICAL ANGLE. FOR
EXAMPLE, THIS READING IS 0105 MILS. WHEN YOU
MEASURE, ROUND OFF TO THE NEAREST .5 MIL.
31WHAT IS THE VERTICAL ANGLE SHOWN BELOW?
A. 94 MILS B. 86 MILS C. -26 MILS D.
-14 MILS
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33WHAT IS THE VERTICAL ANGLE SHOWN BELOW?
34DECLINATING THE AIMING CIRCLE
35- MAGNETIC NORTH VARIES WIDELY IN DIFFERENT
REGIONS OF THE PLANET DUE TO MASSIVE ORE DEPOSITS
UNDER THE EARTHS SURFACE - CORRECTING FOR THESE DIFFERENCES IS DONE USING
A PROCESS CALLED DECLINATION WITH THE END RESULT
BEING A DECLINATION CONSTANT - THE DECLINATION CONSTANT IS A VALUE APPLIED TO
THE SCALES OF THE AIMING CIRCLE TO CHANGE
MAGNETIC AZIMUTHS TO GRID AZIMUTHS IN YOUR LOCAL
OPERATIONAL AREA
36DECLINATING THE AIMING CIRCLE
- SETUP THE AIMING CIRCLE OVER A DECLINATION
STATION AND LEVEL THE INSTRUMENT - UTILIZING THE RECORD KNOB(UPPER MOTION) SET
KNOWN AZIMUTH - UTILIZING THE NON-RECORD KNOB(LOWER MOTION)
SIGHT ON AZIMUTH MARKER - WITH THE RECORD KNOB AGAIN, SIGHT THE ELBOW
TELESCOPE IN GENERAL DIRECTION OF NORTH - ref 6-50, pg
2-1
37DECLINATING THE AIMING CIRCLE
- UNLOCK MAGNETIC COMPASS NEEDLE
- TURN THE RECORD KNOB UNTIL MAGNETIC COMPASS
NEEDLE IS CENTERED ON THE MIDDLE RETICLE. LOOK
THROUGH MAGNIFIER. READ DECLINATION CONSTANT
DIRECTLY FROM AZIMUTH SCALE(NEAREST .5 MIL). - RECORD THIS INDICATION. REPEAT THIS PROCESS AND
RECORD THE AVERAGE - Note ALL THE INDICATIONS MUST BE WITHIN /-2
MILS OF EACH OTHER. -
- ref 6-50, pg 2-1
38OCCASIONS FOR DECLINATION
- EVERY THIRTY DAYS
- AFTER SEVERE ELECTRICAL STORMS
- AFTER BEING DROPPED
- AFTER INITIAL ISSUE OR UPON RETURN FROM
MAINTENANCE - AFTER MOVEMENT OF MORE THAN 40KM OR 25 MILES FROM
LAST DECLINATION POINT
39ORIENT THE AIMING CIRCLE TO GRID NORTH
40(1) READ THE DECLINATION CONSTANT FROM THE
NOTATION PAD (2) USE THE UPPER (RECORDING)
MOTION TO SET THE DECLINATION CONSTANT ON THE
AZIMUTH AND AZIMUTH MICROMETER SCALES
41ORIENT THE AIMING CIRCLE TO GRID NORTH
- (3)UNLOCK THE MAGNETIC NEEDLE
- LOOK IN THE WINDOW ON TOP OF THE AIMING CIRCLE
MAIN BODY - USE THE LOWER (NON-RECORDING) FAST MOTION TO
ROTATE THE AIMING CIRCLE HEAD UNTIL THE MAGNETIC
NEEDLE MOVES TO CENTER OF THE WINDOW.
MAGNETIC NEEDLE
LOCKING LEVER IN UNLOCKED POSITION
42ORIENT THE AIMING CIRCLE TO GRID NORTH
(6) LOOK INTO THE MAGNIFIER AND CENTER THE
HAIRLINE ON THE WHITE AREA ON THE END OF THE
MAGNETIC NEEDLE USING THE ORIENTING KNOB (7)
LOCK MAGNETIC NEEDLE (8) THE AIMING CIRCLE IS
NOW ORIENTED AND CAN BE USED TO MEASURE GRID
AZIMUTHS
43QUESTIONS