a. A straight line that touches, but does not transect, a given curve or surface at one and only one point; a line that touches a circle and is perpendicular to its radius at the point of contact. AGI
b. The part of a traverse included between the point of tangency (the point in a line survey where a circular curve ends and a tangent begins) of one curve and the point of a curvature (the point in a line survey where a tangent ends and a circular curve begins) of the next curve. AGI
c. A great-circle line that is tangent to a parallel of latitude at a township corner in the U.S. Public Land Surveys system. AGI
d. A term sometimes applied to a long straight line of a traverse whether or not the termini of the line are points of curve. AGI
e. The ratio of the length of the leg opposite an acute angle in a right-angled triangle to the length of the leg adjacent to the angle. Adj. said of a line or surface that meets a curve or surface at only one point. AGI
Source:
Dictionary of Mining, Mineral, and Related Terms












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