dioptra
Noun
Meaning
An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc.
Source: Webster's dictionarySynonyms
theodolite
optical instrument
surveyor's instrument
measuring tool
surveying instrument
angle measurement device
angle measurement tool
land surveying instrument
angle measuring instrument
geodetic instrument
geodetic tool
geodetic measuring tool
instrument for measuring angles
land surveying equipment
optical measuring instrument
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