Question

The circular head of a screw gauge is divided into 200 divisions and move 1 mm ahead in one revolution. Find the pitch and least count of the screw gauge. If the same instrument has a zero error of -0.05 mm and the reading on the main scale in measuring diameter of wire is 6 mm and that on circular scale is 45, find the diameter
of the wire.​

Answer 1

Answer:

the circular head of a screw gauage is divided into 200 divisions