comparator

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A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England

Inventors and Inventions of the Industrial Revolution

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America’s 5 Most Notorious Cold Cases (Including One You May Have Thought Was Already Solved)

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10 Greatest Baseball Players of All Time

The Cheshire Cat is a fictional cat from Lewis Carroll's Alice's Adventures in Wonderland. (Alice in Wonderland)

11 Banned Books Through Time

Close up of books. Stack of books, pile of books, literature, reading. Homepage 2010, arts and entertainment, history and society

12 Novels Considered the “Greatest Book Ever Written”

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8 of the Largest Empires in History

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Pro and Con: School Uniforms

comparator

measurement instrument

Also known as: visual gauge

Learn about this topic in these articles:

deviation-type gauges

In gauge
…align work in machine tools; comparators, or visual gauges; and air gauges, which are used to gauge holes of various types. Very precise measurements may also be obtained by the use of light-wave interference, but the instruments that do so are referred to as interferometers.
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