Advanced Surveying 313321 ASU Practical No: 01 Determine the Tachometric Constants
Tachometry is used for the preparation of topographic maps where both horizontal and vertical distances are required to be measured; survey work in difficult terrain where direct measurements are inconvenient; reconnaissance survey for highways and railways etc. Establishment of secondary control points.
Observation Table
Result
The experiment results demonstrate that the calculated distances between the instrument station and each peg point are consistent and accurate, confirming the correct application of chemometric principles.
Practical Related Questions:
1. Explain the principle of Tacheometry?
Answer:
2. Give the characteristics of the Tacheometer.
Answer:
- Value of multiplying constant, k=100
- Value of additive constant, C=0
- Telescope should be fitted with an anallactic lens which is a type of convex lens.
- Magnifying power of the eye-piece should be kept high to make the staff graduations clearly visible even from a large distance.
- The aperture of the objective is kept roughly between 35 mm to 45 mm to make the image sharper.