Experiment no 10-setting up the theodolite

Surveying lab experiment no.10 Setting up of thodolite instrument
Optical reading telescope
for H and V angle reading
Optical micrometer
Horizontal and vertical
clamps
Leveling screws
Optical theodolite
Digital theodolite
Objective lens
Vertical circle
Level tube
Optical plummet
Horizontal circle
Tribrach
Horizontal and vertical
slow motion screws

Setting up the theodolite
1- Fix a clearly defined point on the ground (X mark)
2 Extend the tripod legs to a proper length (around shoulder height), and set the
tripod approximately over the marked survey point
3 The tripod head should be leveled.
4 Carefully take the theodolite out of the carrying case, and remember how it was
fitted in the box so that you know how to put it back later
5 Mount it on the tripod, and fasten the tripod screw
6 Fix the front tripod leg. Hold and move the two other legs to roughly center the
theodolite by locating the ground mark via the optical plummet (or laser spot)

7 -Rough Levelling : (use the circular bubble as the guide): By adjusting the
length of one tripod leg at a time while keeping the other two still, the circular
bubble can be levelled without causing disturbance to the previously
accomplished centering (check the optical plummet or laser spot to see this is
true).
8 - Precise Levelling (optical theodolite)
Rotate the theodolite until its plate bubble is parallel to any two leveling screws (A
and B), then adjust screws A and B to center the bubble. The left thumb rule
applies as usual (bubble will travel in direction of left thumb). Now rotate the
theodolite body by 90°, and center the bubble with the third leveling screw (C)
only. Repeat this procedure for each 90° revolution of the instrument until the
bubble is centered for all four positions. Now check the optical plummet(or laser
spot) if the adjustment of the leveling screws has probably disturbed the centering.

Levelling the electronic level of the digital theodolite
9 - Precise Centering
Loosen the tripod screw, and slowly translate (do not rotate) the theodolite
around until it is exactly centered over the survey point, then tighten the screw.
10 - Repeat centering and leveling.
The Display screen of the digital theodolite
1-configuration screen 2- theodolite screen