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4 Measuring
Measuring (Height)
In order to measure the difference in height between point A and point B.
1. Set up the instrument almost in the middle of the points.
2. Provide a levelling rod at point A and B, one each, collimate them and read the horizontal
line of the reticule.
3. Suppose the reading at point A is a and than at point B is b, and the difference in height
between the two points will be: a – b.
Note:
Be sure that the levelling rods are almost vertical. It is recommended to position the level
almost in the center of points A and B to avoid influence by the axis of vision on the
measuring even if it varies a little in terms of being horizontal.
Measuring (Horizontal angle)
The horizontal circle has a clockwise graduation from 0 gon to 400 gon numeric indications
even 10 gon.
1. Attach the plumb bob string to the plumb bob hook and adjust the string length.
2. Loosen the tripod screw a little, and move the instrument according to the apex to match
the plumb bob end with the measuring point.
3. Re-tighten the tripod screw.
4. Use the levelling screws to center the circular level.
5. Sight target A and turn the horizontal circle to bring the scale to "zero". Sight target B, and
then reading (31 gon) will be a horizontal angle between points A and B.
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