Question

explain positive and negative zero error of a screw gauge ​

Answer 1

Answer:

Explanation:

Calculating zero error in screw guage - definition

Case (b): Positive zero-error of 2 circular scale division. Positive zero-error correction is done by subtracting the positive zero-error from the actual reading. ... Negative zero-error correction is done by adding the negative zero-error from the actual reading.