Question

The needle of magnetic compass is generally supported on a

Answer 1

The needle of magnetic compass is generally supported on a Jewel Bearing. A jewel bearing is a plain bearing in which a metal spindle turns in a jewel-lined pivot hole.

The hole is typically shaped like a torus and is slightly larger than the shaft diameter.

These are used in instruments where low friction, long life, and dimensional accuracy are important.

They are largely used in mechanical watches and galvanometers, compasses, turbine flow meters.