Chorobates

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

The chorobates, described by Vitruvius in Book VIII of the De architectura, was used to measure horizontal planes and was especially important in the construction of aqueducts (mainly during Roman Times).

Excerpt from the Wikipedia article “Chorobates”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Yoni Toker, CC BY-SA 4.0, via Wikimedia Commons.