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Q: The vernier that is calibrated in the direction opposite to the main scale is called ........ SSC JE 25.01.2018, Evening Shift Or If the smallest division of a Vernier is longer than the smallest division of its primary scale, the Verneir is known as :
  • A. Retrograde vernier
  • B. Direct vernier
  • C. Double vernier
  • D. Simple vernier
Correct Answer: Option A - Retrograde vernier– A retrograde vernier is the one which extends or increases in opposite direction as that of the main scale and in which the smallest division of the vernier is longer than the smallest division on the main scale. • It is so constructed that (n + 1) divisions of the main scale are equal in length of n divisions of the vernier.
A. Retrograde vernier– A retrograde vernier is the one which extends or increases in opposite direction as that of the main scale and in which the smallest division of the vernier is longer than the smallest division on the main scale. • It is so constructed that (n + 1) divisions of the main scale are equal in length of n divisions of the vernier.

Explanations:

Retrograde vernier– A retrograde vernier is the one which extends or increases in opposite direction as that of the main scale and in which the smallest division of the vernier is longer than the smallest division on the main scale. • It is so constructed that (n + 1) divisions of the main scale are equal in length of n divisions of the vernier.