Question

the barrel english outside micrometer is having?

Answer 1

MICROMETERS ARE ARE AVILABLE WITH METRIC AND IMPERIAL.GRAUDTATIONS. THE MICROMETER CONSITS OF A SEMICIRCLE FRAMES HAVING A CYLIDRICAL EXTENSION THE BARREL (SLEEVE) AT IT RIGHT ON A HARDENDED AVIL ON THE OTHER END. THE BORE OF THE BARREL (SLEEVE) IS THERDED AND A SPINFLE SCREWS INTO THE BORE.

Answer 2

A micrometer (/maɪˈkrɒmɪtər/ my-KROM-i-tər), sometimes known as a micrometer screw gauge, is a device incorporating a calibrated screw widely used for accurate measurement of components[1] in mechanical engineering and machining as well as most mechanical trades, along with other metrological instruments such as dial, vernier, and digital calipers[2]. Micrometers are usually, but not always, in the form of calipers (opposing ends joined by a frame). The spindle is a very accurately machined screw and the object to be measured is placed between the spindle and the anvil. The spindle is moved by turning the ratchet knob or thimble until the object to be measured is lightly touched by both the spindle and the anvil.

Micrometers are also used in telescopes or microscopes to measure the apparent diameter of celestial bodies or microscopic objects. The micrometer used with a telescope was invented about 1638 by William Gascoigne, an English astronomer.

Colloquially the word micrometer is often shortened to mike or mic