page_title: Micrometer
section_title: Basic types
hierarchical_section_title: Micrometer / Types / Basic types
caption_attribution_description: English: Quoted from source book, Woodworth 1908 p203 - Large Micrometer Calipers At The British Westinghouse Works - We are pleased to place before our readers a partial description of another set of large aluminum zinc calipers, of which one size is shown in Fig. 221, that may in a sense be said to be the descendant of those illustrated in Section I, having been made and being in use in the Manchester Works of the British Westinghouse Electric &amp; Manufacturing Company, Limited.
context_page_description: A micrometer, sometimes known as a micrometer screw gauge, is a device incorporating a calibrated screw widely used for accurate measurement of components in mechanical engineering and machining as well as most mechanical trades, along with other metrological instruments such as dial, vernier, and digital calipers. Micrometers are usually, but not always, in the form of calipers. 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.
caption: Large micrometer caliper
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