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Difference between fixed hair and movable hair of tachometry..
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written 7.3 years ago by
k.ropet
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| Sr.no | Fixed hair | Movable hair |
|---|---|---|
| 1 | In this method interval between two stadia hair is fixed. | In this method interval between two stadia hair is variable. Stadia line are not fixed and moved by micrometre screw. |
| 2 | In this method horizontal distance from the instrument to the staff can be determine from the value of staff intercept intercepted by the stadia line. | In this method horizontal distance from the instrument to the staff can be determine from the value of stadia variable interval. |
| 3 | Staff intercept varies with the distance at which the staff is held. | The staff is provided with two vanes or target fixed at a known distance apart normally 3m to staff. |
| 4 | This method is commonly used | This method is not commonly used but now rarely used. |
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