discuss the necessity of invention of vernier caliper and screw gauge
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Vernier calipers and screw gauge both have sub-scale so it helps to maintain high precision &accuracy. (ii)Thickness of the metal sheet or paper. ... The secondary scale is used to measure a pitch of the screw and the scale is divided into 50 equal parts and measures 100th of a mm.
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Answer:
A vernier scale is visual aid to take an accurate measurement reading between two graduation markings on a linear scale by using mechanical interpolation; thereby increasing resolution and reducing measurement uncertainty by using vernier acuity to reduce human estimation error.
Vernier caliper scales; main at top, vernier at bottom. It reads 3.58 ± 0.02 mm by adding 3.00 mm (left red mark) on the fixed main scale to vernier 0.58 mm (right red mark). The main scale reading is that to the left of the zero on the vernier scale. The vernier reading is found by locating the best aligned lines between the two scales. The 0.02 mm engraving indicates the caliper's readability and is the "vernier constant" for this scale.
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