Dioptra
Classical surveying instrument from the 3rd century BCE / From Wikipedia, the free encyclopedia
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This article is about a surveying instrument. For other uses, see dioptra (disambiguation).
A dioptra (sometimes also named dioptre or diopter, from Greek: διόπτρα) is a classical astronomical and surveying instrument, dating from the 3rd century BC. The dioptra was a sighting tube or, alternatively, a rod with a sight at both ends, attached to a stand. If fitted with protractors, it could be used to measure angles.
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