| NOUN | artifact | Abney level | a surveying instrument consisting of a spirit level and a sighting tube |
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| Meaning | A surveying instrument consisting of a spirit level and a sighting tube; used to measure the angle of inclination of a line from the observer to the target. | |
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| Broader | surveyor's level | surveying instrument consisting basically of a small telescope with an attached spirit level rotating around a vertical axis |
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