What is the difference between a theodolite and a tacheometer. Give any two characteristics of tacheometer.

What is the difference between a theodolite and a tacheometer. Give any two characteristics of tacheometer.
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1 Answer

Answer :

Difference between theodolite and tacheometer.

Sr.No
Theodolite
Tacheometer
1 It is most accurate instrument use for measurement of horizontal and vertical angle.
Tacheometer is usually a transit theodolite having a stadia diaphragm. 
2 In case of theodolite,the distance is measured on the field by chain or tape. 
In case of tacheometer distance is calculated by direct formula. 
3 Suitable for plane areas with less obstacles. 
Suitable in case of obstruction like steep and broken ground. 
4 More station are required to take reading on field. 
Less stations are required to take reading on field. 

 

Characteristics of tacheometer:

 1. The value of constant f/i = 100 Where, f = focal length i = length of image.

2. The telescope should be powerful, the magnification should be 20 to 30 times the Diameter.

3. The telescope should be fitted with anallatic lens to have the value of f +d = 0

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

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