What is a micrometre screw gauge?
How the zero error can be corrected?
How can you define the term least count?
Answers
Answer:
the head scale zero is just above the index line of the pitch scale then the screw gauge has negative error and correction is positive head scale zero is just below the index line of the pitch scale , then the screw gauge has positive error and zero correction is negative .The correction must applied to the observed
The smallest value that can be measured by the measuring instrument is called its least count. Measured values are good only up to this value. The least count error is the error associated with the resolution of the instrument.
Micrometer Screw Gauge. 1. Positive zero error occurs when the '0' marking of the thimble scale is below the horizontal reference line of the main scale. The error is +x mm. To correct the reading, we subtract the error from the measurement.
Answer 1
Micrometre is a device which is used to measure the linear dimension of a small object.example diameter of a wire .This instrument has a least count of 0.001 metre and therefore it is called micrometre screw gauge.
Answer 2
zero error can be corrected by subtracting zero error from the observed reading and suitable sign.
Answer 3
list count is the ratio of speech to the total number of division on circular scale.
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