This is most commonly used. In this type of instrument, observations are taken by using the principle of vernier caliper. The precision of this type of instrument varies in the order of 10" to 20". A typical vernier theodolite is as shown in Figure 20.1(a) and its sectional view in Figure 20.1(b). The schematic representtion of this type of theodolite is given in Figure 20.1(c).
(i) Face left View |
(ii) Side View |
Figure 20.1 (a) Vernier Theodolite
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Figure 20.1 (b) Sectional View of a Vernier Theodolite |
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