a. In mine surveying, a movable arm used to read horizontal angular distances. Pryor, 3
b. A device having a level bubble combined with a quarter or a half circle graduated in degrees that is used by drillers to determine the inclination of a drill stem and/or borehole at the collar of the borehole. Also called angle level; angle rule; clinometer; clinometer rule. Long
c. An instrument used in planetable surveying, consisting of a telescope or sighting device pivoted to swing through a vertical graduated arc atop a vertical stand attached to a steel rule, one edge of which is parallel with the sight line of the telescope. Long
d. Sometimes incorrectly used as a syn. for transit; theodolite. Long
e. A rule equipped with simple or telescopic sights, used for determining the directions of objects, specif., a part of a surveying instrument consisting of a telescope or other sighting device, with index and reading or recording accessories. AGI
f. A surveying instrument used with a planetable for mapping; e.g., peep-sight alidade and telescopic alidade. AGI
Source:
Dictionary of Mining, Mineral, and Related Terms












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