Manufacturers Recommendation for Setting up a Theodolite 1

Manufacturer’s Recommendation for Setting up a Theodolite 1) Ensure that : - • the tripod head is approximately level • the tripod feet are firmly fixed in the ground This should be done BEFORE removing theodolite from its box. 2) Place theodolite on top of the tripod, and tighten the centring screw to clamp theodolite centrally on the tripod head. 3) Use the optical plummet to focus onto the survey station (e. g. nail in top of peg) • Turn the optical plummet eyepiece to focus the reticle (i. e. the black circular mark) • push (or pull) the optical plummet focussing ring to focus on the survey station

Optical Plummet Rotate to focus reticle Pull in / out to focus on the ground (survey station)

Manufacturer’s Recommendation for Setting up a Theodolite 1) Ensure that : - • the tripod head is approximately level • the tripod feet are firmly fixed in the ground This should be done BEFORE removing theodolite from its box. 2) Place theodolite on top of the tripod, and tighten the centring screw to clamp theodolite centrally on the tripod head. 3) Use the optical plummet to focus onto the survey station (e. g. nail in top of peg) • Turn the optical plummet eyepiece to focus the reticle (i. e. the black circular mark) 4) 5) • push (or pull) the optical plummet focussing ring to focus on the survey station By rotating the levelling foot SCREWS, using all three in a random manner if necessary, centre the reticle (black circle) in the optical plummet onto the survey station. Carry out an approximate levelling. Using the pond bubble and by adjusting the length of TWO tripod LEGS, bring the pond bubble into the centre of the pond bubble tube.

Manufacturer’s Recommendation for Setting up a Theodolite 1) Ensure that : - • the tripod head is approximately level • the tripod feet are firmly fixed in the ground This should be done BEFORE removing theodolite from its box. 2) Place theodolite on top of the tripod, and tighten the centring screw to clamp theodolite centrally on the tripod head. 3) Use the optical plummet to focus onto the survey station (e. g. nail in top of peg) • Turn the optical plummet eyepiece to focus the reticle (i. e. the black circular mark) 4) 5) • push (or pull) the optical plummet focussing ring to focus on the survey station By rotating the levelling foot SCREWS, using all three in a random manner if necessary, centre the reticle (black circle) in the optical plummet onto the survey station. Carry out an approximate levelling. Using the pond bubble and by adjusting the length of TWO tripod LEGS, bring the pond bubble into the centre of the pond bubble tube. The theodolite is ROUGHLY LEVELLED AND CENTRED over the station.

(continued) Manufacturer’s Recommendation for Setting up a Theodolite 6) Fine level theodolite using the PLATE level bubble tube and foot SCREWS • Position a) align the plate level bubble tube with two foot screws. Centre the bubble by rotating the two foot screws in opposite directions. The bubble follows the LEFT thumb.

Bubble follows LEFT THUMB Position a

Plate Level Bubble Tube Required to move the bubble to the right Foot Screws Bubble follows direction of left thumb Both thumbs move in (or out)

Bubble follows LEFT THUMB Position a

Position a

Manufacturer’s Recommendation for Setting up a Theodolite 6) Fine level theodolite using the PLATE level bubble tube and foot SCREWS • Position a) align the plate level bubble tube with two foot screws. Centre the bubble by rotating the two foot screws in opposite directions. The bubble follows the LEFT thumb. • Position b) align the plate level bubble tube with the third foot screw. i. e. 900 from position a) Centre the bubble by rotating the third foot screw (only) The bubble follows the LEFT thumb.

Bubble still follows LEFT THUMB Position b 900 to position a

Using the third footscrew only Select “Setting up a theodolite --- 3”