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What is the use of circular vernier as a measuring instrument?

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What is the use of circular vernier as a measuring instrument?

(a) Measuring small angle

(b) Measuring large angle

(c) Measuring required accurate angle

(d) Normal angle

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The above asked question is from Scales topic in portion Lettering Practice, Scales & Curves of Civil Engineering Drawing

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The correct option is (c) Measuring required accurate angle

To explain I would say: Verniers are also extensively used to circular scales in variety of scientific instruments.

The below figure shows typical arrangement of double direct verniers.

In Fig. the scale is graduated to 10 and value of n=10 on the vernier. 10 vernier divisions = 9 main scale divisions. Hence the least count is = d/n = 10/10 = 6′. The reading is 19 0 48′.

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