Define tacheometer. State essential characteristics of tacheometer.

Define tacheometer. State essential characteristics of tacheometer.
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Answer :

Tacheometer

A tacheometer is essentially a transit theodolite having a stadia diaphragm. The diaphragm is equipped with two horizontal hairs called stadia hairs in addition to the regular cross hairs.

Essential Characteristics of a Tacheometer :

1. The value of constant f/i = 100.

2. The telescope should be fitted with anallatic lens having value of (f+c) = 0

3. The telescope should be powerful, the magnification should be 20 to 30 times the diameters.

4. The vision through the telescope should give a clear and bright image for a long distance.

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