Micrometer
[maɪ'krɒmɪtə] or [maɪkrɑmɪtɚ]
Definition
(n.) An instrument, used with a telescope or microscope, for measuring minute distances, or the apparent diameters of objects which subtend minute angles. The measurement given directly is that of the image of the object formed at the focus of the object glass.
Checked by Clive
Definition
n. an instrument for measuring minute distances or angles.—adjs. Micromet′ric -al.—ns. Microm′etry measuring with a micrometer; Mī′cron the millionth part of a metre or 1⁄25400 of an inch; Mī′cro-or′ganism a microscopic organism.
Checker: Marsha
Examples
- The micrometer was a further advance in exact measurement. Walter Libby. An Introduction to the History of Science.
- This is ascertained by means of a micrometer screw, S, which moves a needle, T, in front of the dial. Frank Lewis Dyer. Edison, His Life and Inventions.
- About 1639 Gascoigne, a young Englishman, invented the micrometer, which enables an observer to adjust a telescope with very great precision. Walter Libby. An Introduction to the History of Science.
- Before the invention of the micrometer exactitude was impossible, because the adjustment of the instrume nt depended on the discrimination of the naked eye. Walter Libby. An Introduction to the History of Science.
Checked by Candy