ETYM Micro- + -meter: cf. French micromčtre.
Instrument for measuring minute lengths or angles with great accuracy; different types of micrometer are used in astronomical and engineering work.
The type of micrometer used in astronomy consists of two fine wires, one fixed and the other movable, placed in the focal plane of a telescope; the movable wire is fixed on a sliding plate and can be positioned parallel to the other until the object appears between the wires.
The micrometer caliper, of great value in engineering, has its adjustment effected by an extremely accurate fine-pitch screw (vernier).Or micron; One-millionth of a meter.
For measuring small distances; SYN. micrometer gauge, micrometer caliper. + prikaži više