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Find the thickness of the wire The main ...

Find the thickness of the wire The main scale division is of `1mm` In a complete rotation the screw advances by `1mm` and the circular scale has 100 devisions

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Excess reading (Zero error) = 0.03mm It is giving 7.67 mm in which there is 0.03mm excess reading which has to be removed (subtracted) so actula reading `=7.67 - 0.03 = 7.64 mm` .
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