6_Theodolites_2016_r1 - Chapter 6 Theodolites The main...

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(Chapter 6) 1 / 7 Chapter 6 Theodolites The main function of theodolite is to measure angles in the horizontal and vertical planes. It is deemed as the scientifically most precise and versatile surveying instrument used for angle measurements. The digital theodolite nowadays enables the surveyor to measure angles to an accuracy of up to 1” (1” = 1/3600°) .
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(Chapter 6) 2 / 7 Applications of Theodolite in surveying: Laying of horizontal angles Locating points on line Prolonging survey lines Establishing grades Determining difference in elevation Setting out curves Aligning tunnels A theodolite consists of a small moveable telescope that is linked with the mechanisms to rotate vertically or horizontally. The theodolite telescope is fixed within perpendicular axes, namely the vertical axis and the horizontal axis. The theodolite is also fixed on a base that can be rotated on a tripod by a leveling system. Similar to the auto level, the theodolite needs to be leveled before it is ready for taking measurements. This can be done by adjusting the foot screw to bring the bubbles to the centre of the circular level and plate level. Also, the theodolite needs to be aligned at the centre point of the desired station (normally marked by the nail on a wooden peg). This can be done by moving the base of the theodolite while observing the location of the wooden peg through the optical plummet. During measurement, the vertical and horizontal angles will be shown on the digital readout panel. In summary, a
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