How to find distance by leveling machine, theodolite and tachometer



In reality, the method we are going to explicate is not only extraordinary for leveling machine. Obviously, this technique can be used using tachometer and any other device like theodolite, etc.
In case there are two points on earth surface like point A and point B and we require the distance between these two points. Here the distance signifies the horizontal distance between these two points.

In order to find the distance, we just set the instrument at one of these points in the graduated staff rod.
The method can be utilized using theodolite and tachometer.
There’re 2 points on earth surface (point A and point B).
The distance between these points is needed.
Here, the distance indicates the horizontal distance amid the two points.

To determine the distance, the instrument is set at one of the points.
Furthermore, upper hair and lower hair readings are needed.
Upper hair reading = 1.112
Lower hair reading = 0.654
Distance = [top reading – bottom reading] x constant
Distance = [1.112 – 0.654] x 100 = 45.8 m

How to obtain the constant
Constant can be found in the guidebook / manual of levelling machine.

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