Creative Teaching

Vernier Caliper Principle - Revisited

A

B

X

X = A – B = Least Count

Why?9 Divisions =10 Divisions

(On Main Scale) (On Vernier Scale)

Why Not?8 = 10

Why not?6 = 10

Why not?7 = 10

(On Main Scale) (On Vernier Scale)

(On Main Scale) (On Vernier Scale)

(On Main Scale) (On Vernier Scale)

Let us solve some examples ……

1 2 3 4 5 60.00

0.10

0.20

0.30

0.40

0.50

0.60

0.70

N+3

LC(mm)

N+1 N+2 N+4 N+5 N+6

N=9

N=19

N=39N=49

N=79

Conclusions:

1. N+1 = N principle gives minimum least count2. Increase in N gives minimum least count3. Students will enjoy the meaning behind the

principle4. Students start exploring the engineering

principles without blindly accepting any concept

10 Divisions on Main Scale

9 Divisions on Vernier Scale

Question ?If by mistake 10 divisions on Main Scale are made equal to 9 divisions on Vernier Scale, then what is the least count? Is it possible to use the instrument? If it is usable, HOW?

Thank You

Dr.P.Madar ValliProfessorIndustrial Engineering DepartmentGIT,Gitam UniversityVisakhapatnam,India