abney_level | ||
1. | [ noun ] 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 | |
Related terms: | surveyor's_level | |
abney_level | ||
1. | [ noun ] 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 | |
Related terms: | surveyor's_level | |