A dioptra is a classical astronomical and surveying instrument dating from the 3rd century BC. It took the form of a sighting tube, or alternatively a rod with a sight at each end, mounted on a stand, and when fitted with protractors it could be used to measure angles.
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Dioptra (Wikipedia)
In Group: Surveying Instruments, Introduction
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.
In Field: Civil Engineering, Lead section
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.
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