A screw gauge in which circular scale has 200 division
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It is not possible to increase the accuracy of a screw gauge by increasing the number of divisions of the circular scale. Increasing the number divisions of the circular scale will increase its accuracy to a certain extent only.
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Diagram below shows a screw gauge in which circular scale has 200 division(assume the pitch is 1 mm)
(1) least number (2) radius of the wire
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