Why is a screw gauge so named?

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Solution

The diameters of wires are represented by standard numbers which is called standard wire gauge (S.W.G). As it measures these diameters so it is called screw gauge.

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Q. Of what metal is the screw of the screw gauge made and why?

What is a screw gauge?

Four screw gauges are to be calibrated to the standard thickness $t_{s t}$ of a wire. Series of measurements were performed by each instrument to obtain a distribution of the measured values as shown.

Which of the following statements is correct?

The thimble of a screw gauge has 50 divisions. The spindle advances 1 mm when the screw is turned two revolutions.

(i) What is the pitch of screw gauge ?

(ii) What is the least count of the screw gauge ?

Draw a neat and labelled diagram of a screw gauge. Name its main parts and state their functions.

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