TM 5-6675-306-14
STEP 1.
UNLOCK THE HORIZONTAL CLAMP. ROTATE THE
U-STANDARD UNTIL THE PLATE LEVEL IS
PARALLEL TO A LINE JOINING ANY TWO
FOOTSCREWS. LOCK THE CLAMP.
STEP 2.
TURN THE TWO FOOTSCREWS THAT ARE
PARALLEL
WITH
THE
PLATE
LEVEL
SIMULTANEOUSLY,
BUT
IN
OPPOSITE
DIRECTIONS UNTIL THE LEVEL BUBBLE IS
CENTERED.
STEP 3.
UNLOCK THE HORIZONTAL CLAMP. ROTATE THE
U-STANDARD 90 AND LOCK THE CLAMP. TURN
THE THIRD FOOTSCREW UNTIL THE LEVEL
BUBBLE IS CENTERED.
STEP 4.
UNLOCK THE HORIZONTAL CLAMP. ROTATE THE
U-STANDARD 180O AND LOCK THE CLAMP.
TURN THE SAME FOOTSCREW AS IN STEP 3 AND
REMOVE
ONE
HALF
OF
ANY
BUBBLE
DISPLACEMENT THAT MAY EXIST.
NOTE:
IF AFTER STEP 4 THE PLATE BUBBLE IS MORE
THAN TWO DIVISIONS FROM CENTRALITY, THE
CORRECTION IS MADE BY MEANS OF THE PLATE
LEVEL ADJUSTING SCREW.
REFER TO
PARAGRAPH 2-9.
Figure 2-23. Theodolite leveling.
2-35
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