Johnson Theodolites 40-6936 Manual De Instrucciones página 10

8863H-All_Manuals 3/19/15 3:25 PM Page 10
• Rotate the leveling screw 1, 2 to move the bubble to the center line
of circular level which is perpendicular to the connection line 1, 2.
• Rotate the leveling screw 3 to move the bubble to the center of the
circular level.
• Next use the Tubular Vial to accurately level the instrument. Unlock
and turn the instrument so that the tubular vial is parallel to BC, any
two leveling screws. Note the direction to turn the leveling screws in
the graphic. When turning the two screws, adjust them equally. The
bubble will move in the direction that your left thumb turns. To move
the bubble to the right, turn the B leveling screw in and
simultaneously turn the C leveling screw in. To move the bubble left,
move both screws out simultaneously. Once centered turn the
instrument 90º over A leveling screw and turn screw A in or out until
bubble is centered. Go back to the first position BC, and repeat until
the bubble is centered in both positions. Then from position BC turn
180º to check the adjustment. If the bubble stays centered or within
1/4 division, you are level.
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