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Question
What do you mean by a positive zero error of a screw gauge? How will you calculate it?
Short Note
Solution
If the zero of the circular scale remains below the line of graduation then it is called positive zero error. When there is a positive zero error, then the instrument reads more than the actual reading. Therefore in order to get the correct reading, the zero error should always be subtracted from the observed reading.
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Vernier Callipers
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