Dioptra
- 窥管（窥管，读音为，汉语词语，意思是管中窥物。比喻见识狭小）
Dioptra
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abstract:
A dioptra () is a classical astronomical and surveying instrument, dating from the 3rd century BCE. The dioptra was a sighting tube or, alternatively, a rod with a sight at both ends, attached to a stand.
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