If the screw on a screw-gauge is given six rotations, it moves by 3 m m on the main scale. If there are 50 divisions on the circular scale the least count of the screw gauge is:

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Pitch = 3 6 = 0.5 m m L.C. = 0.5 50 m m = 1 100 m m = 0.1 m m = 0.001 c m

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