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Surveying - Engineering

Q1:

If the smallest division of a vernier is longer than the smallest division of its primary scale, the vernier is known as

A direct vernier

B double vernier

C retrograde vernier

D simple vernier.

ANS:C - retrograde vernier

The equation for Retrogate Vernier:

V*n = (n+1)*S.
Therefore V > S. There are two types of vernier maily used.

1. simple vernier.
2. Retrogate Vernier.

Retrogate Vernier primary scale smallest division is less thn the Vernier scale division.