Question

What is the use of a ratchet to the screw gauge by a spring

Answer 1

The thimble carries the vernier or secondary scale. There is one more part called the ratchet which is provided at the end of the tube. The ratchet is kind of limiting device which applies a pressure by slipping at a predetermined torque and thus prevents the spindle from moving further.

Answer 2

Answer:

the Timbler carries........