Auto level is a
leveling instrument used in the surveying and construction to measure height
differences and to transfer, measure, and set heights of known objects or marks.
The ease of use of the auto level has made it popular among surveyors. Ease
of use of auto level saves time and money
An autolevel machine is
a professional tool commonly used for precise leveling. It is also used to
measure horizontal distances on site. The method used to find the horizontal
distance is known as the 'stadia method'.
The tool must be used on a level surface to make this method work correctly. The discovery of the Stadia range is good for finding topographical details such as rivers, fields, bridges, roads and buildings.
To measure horizontal
distance with the Stadia measuring method, hold the staff rod so that it can be
seen between the two stadia marks on the instrument's reticle (see figure- 1).Focus
the auto level machine on the level staff, read the measurements of both cross
and stadia hair markings.
For
example:
Upper
Stadia Hairs = 1.56 metre
Lower
Stadia Hairs = 1.23 metre
Now
Difference between Upper Stadia and Lower Stadia = 1.56 – 1.23 = 0.33 metre
Now
convert the 0.33 meter into cm i.e, 0.33 x 100 = 33 cm.
In
Autolevel machine, the scale of the difference of Upper Stadia and Lower Stadia
is designed in such a manner i.e,
1 cm = 1 m
So, we can
say The horizontal distance is 33 metre.
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