Ex.23-1 What is tacheometry? Enumerate its uses.

Ex.23-2 Describe the conditions under which tacheometric surveying is advantageous.

Ex.23-3 What is an anallactic lens? State its significance in tachometric surveying.

Ex.23-4 A tacheometer is placed at a station A and readings on a staff held vertical upon a B.M. of RL =100.0 meter and at station B are 0.640, 2.200, 3.760 and 0.010, 2.120, 4.230 m respectively. The angle of depression of the telescope in the first case is 6° 19' and in the second case is 7° 42'. Find the horizontal distance from A to B and the RL of station B, if the instrument has constants 100 and 0.5.

Ex.23-5 To determine the distance between two points P and Q and elevation of Q, following observation were made:

Height of tacheometer at P = 1.280 m

Vertical angle at P = + 4° 25' 20 "

Staff reading (with staff vertical) = 1.545, 1.905, 2.265

R.L. of P = 123.265 m.

Calculate the unknown parameters after establishing the fundamental relations.

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