Chapter 3 of 2363 min read
Measuring instruments: vernier, screw gauge
Why this is asked: A screw gauge's zero-error sign is the trap: a positive zero error is subtracted from the observed reading, but a negative zero error is subtracted as a negative number — which means it's effectively added back.
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- •Consider the diameter of a spherical object being measured with the help of a Vernier callipers. Suppose its 10 Vernier scale divisions (V.S.D.) are equal to its 9 main scale divisions (M.S.D.). The least division on the M.S. is 0.1 cm and the zero of the V.S. is at cm when the jaws of the Vernier callipers are closed. If the main scale reading for the diameter is cm and the number of the coinciding Vernier division is 8, the measured diameter after zero-error correction is:
- •In a vernier callipers, divisions of the vernier scale coincide with divisions of the main scale. If 1 MSD represents 0.1 mm, the vernier constant (in cm) is:
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