MICROMETER SCREW GAUGES: Stainless steel, Large demo

MICROMETER SCREW GAUGES: Stainless steel, Large demo

•  Micrometer screw gauges available for use in the science laboratory.

(Wikipedia excerpt: ..."...A micrometer (/maɪˈkrɒmɪtər/ my-KROM-it-ər[1]), sometimes known as a micrometer screw gauge (MSG), is a device incorporating a calibrated screw for accurate measurement of the size of components.[2] It is widely used in mechanical engineering, machining, metrology and most mechanical trades, along with other dimensional instruments such as dial, vernier, and digital calipers. 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.
History
Gascoigne's Micrometer, as drawn by Robert Hooke, c. 1668

The word micrometer is a neoclassical coinage from Greek: μικρός, romanized: micros, lit. 'small' and Greek: μέτρον, romanized: metron, lit. 'measure'. According to the Merriam-Webster Collegiate Dictionary,[3] the word was loaned to English from French, with its first known appearance in English writing being in 1670. Neither the metre nor the micrometre (μm) nor the micrometer (device) as we know them today existed at that time. However, the people of that time did have much need for, and interest in, the ability to measure small things and small differences. The word was no doubt coined in reference to this endeavor, even if it did not refer specifically to its present-day senses...")

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