16. Draw a neat and labelled diagram of a screw gauge.
Name its main parts and state their functions.
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The main parts and their functions are:
1. Ratched - advance the screw by turning it till the object to be measured in held gently in between the spindle of the screw and the stud.
2. Sleeve - it notes the base line and the base line
3. Thimble - circular scale is marked by the thimble
4. Circular scale - reads length correctly to 0.01 mm
5. Main scale - reads length to 1 mm.
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