LEAST COUNT OF SURVEYING INSTRUMENTS

LEAST COUNT OF SURVEYING INSTRUMENTS

Least count means the minimum value that an instrument can read .

1.least count of Theodolite:------- 20"(second)

2.least count of Prismatic compass: least count is ----  30'(minutes)

3.least count of levelling staff is ------- 5mm

4.least count of dumpy level -------5mm
 as it is based on staff reading that's why least count is 5mm.

5.Total station : Least count for total station for angle is 1''(second) & Distance is 1mm

Questions Based On Least Count of surveying instruments

1) What is least count in surveying?

Ans- Least Count Is The minimum value or minimum reading that an instrument can read While Measuring.

Theodolite:- least count is 20"

Prismatic compass:- least count is 30'

least count of levelling staff is 5mm.

dumpy level:- least count 5mm as it is based on staff reading thats why least count is 5mm.

2 ) What is the least count of chain?

Ans- Metric chain Least Count is 0.2m.

3) How do I calculate least count?
 or, How Can I calculate least count?
 or, Least Count Calculations ?

Ans- We Can Easily Calculate by dividing main scale reading To the total number of divisions on the main scale.

If the instrument has a Secondary scale. Then instrument Least Count is the ratio of main scale Least Count. and number of divisions on the secondary scale.

4) What is the least count of steel rule?

Ans- basically It Depends Upon the type of steel rule which you want to use but generally least count is 0.5mm

5) What is the least count of Surveyor's compass ?

Ans- least count of Surveyor's compass is 15' (minutes)

6)What is least count of transit theodolite?

In Transit Theodolite 175 mm internal focusing with erect image, 20 seconds / 10 seconds least count Which Can Be read by reading glass, provided with optical plummet for accuracy in centering point.

7) What is least count of main scale and vernier scale in theodolite?

 vernier scale is divided into 10 divisions which Divided with 9 divisions of the main scale

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