MEASUREMENT FOUNDATION
9
VERTICAL
5. Measurements
Vertical measurements
1) Watch laser target and laser marker in the eyepiece of the instrument. If necessary, adjust sharpness of manual focusing;
2) Laser target can be moved vertically for transmission of reference point on desired height;
3) As a result you will get reference point. Line that connects these two points will be vertical.
Vertical measurements in wells
Such measurements can be used in mine survey and engineering surveying.
E.g. transfer of line (of given direction). As it is shown in the picture 6, lines A and B are known refer-
ence mark. Part of this line goes under well. There are two additional dots C and D on this line.
Transmission is made following way:
1) Place the instrument in the bottom of the well. Be sure, laser plumb (zenith) must coincide
with dot C;
2) Laser plumb down marks dot E, which will be the projection of dot C;
3) Do the same transmission of the dot D. Dot F is the projection of dot D;
6. Adjustment of the instrument
Adjustment of the tubular level
Axis of the level must be perpendicular to the rotation axis of the theodolite. Turn the alidade of the instrument, so that the axis
of tubular level will be parallel to the imaginary line, that connects centers of any 2 foot screws of the tribrach. Rotate these 2
screws in opposite directions, so that the bubble will be in the center of level. Rotate alidade of the instrument by 90° and with
the help of third screw place the bubble in the center.
Rotate alidade of the instrument by 90° once more. If necessary, place the bubble in the center of the level. Rotate alidade
Pic.6
A
C
D
B
E
F
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