what do you mean by zero error of a screw gauge ? How it is accounted for ?
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Explanation:
It is either above or below the base line of the main scale, in which case the screw gauge is said to have a zero error. It can be both positive and negative. It is accounted by subtracting the zero error (with sign) from the observed reading in order to get the correct reading.
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Answer:
It is either above or below the base line of the main scale, in which case the screw gauge is said to have a zero error. It can be both positive and negative. It is accounted by subtracting the zero error (with sign) from the observed reading in order to get the correct reading.
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