# Reed level

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[[File:Reed-level.png|thumb|Water is poured into the center top of the reed grass. The total amount of water, as illustrated by '''A{{sup|(100%)}}''', needs to be equally distributed across '''B{{sub|1}}''' and '''B{{sub|2}}'''. Equal output at both sides indicates that the reed is horizontally [leveled](/source/spirit_level).]]

A '''reed level''' is an [Arabian](/source/Arabian) invention used for determining the [level](/source/Horizontal_plane) in [construction](/source/construction). It involves creating a hole through a long, straight [reed](/source/Reed_(plant)) and pouring water into its center. The reed is considered level when the flow of water out of both sides is equal.<ref>{{cite web|url=http://www.history-science-technology.com/articles/articles%2011.html|title= Engineering in Arabic-Islamic Civilization|first1= Donald R.|last1= Hill| first2=Ahmad Y.|last2=al-Hassan|website=history-science-technology.com|accessdate=11 September 2016}}</ref> This device serves the same purpose as a [spirit level](/source/spirit_level).

==References==
{{Reflist}}

Category:Arab inventions
Category:Inclinometers

{{Tech-stub}}

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