# Macrometer

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{{distinguish|Macrometer (GPS)}}

A '''macrometer''' is an instrument for measuring the size and distance of distant objects.<ref name="United States. Department of the Army 1961 p. 318">{{cite book | author=United States. Department of the Army | title=Dictionary of United States Army Terms | publisher=Headquarters, Department of the Army | series=Army regulation | year=1961 | url=https://books.google.com/books?id=JJcrAAAAYAAJ&pg=PA318 | access-date=2021-05-15 | page=318}}</ref> Distant in this sense means a length that can not be readily measured by a [calibrated](/source/calibration) length. The optical version of this instrument used two [mirror](/source/mirror)s on a common [sextant](/source/sextant). By aligning the object on the mirrors using a precise [vernier](/source/Vernier_scale), the position of the mirrors could be used to compute the range to the object. The distance and the angular size of the object would then yield the actual size.

==See also==
* [Rangefinder](/source/Rangefinder)
* [Theodolite](/source/Theodolite)

==References==
{{reflist}}

Category:Surveying instruments
Category:Surveying
Category:Length, distance, or range measuring devices

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Adapted from the Wikipedia article [Macrometer](https://en.wikipedia.org/wiki/Macrometer) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Macrometer?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.