INSTRUMENTAL.—By the use of instruments.
LINE.—A line has length, only, as A C; a right line is a straight line, the shortest line that can be drawn between two points, A——C.
Straight. One which has the same direction throughout its entire length.
Curved. One no part of which is straight.
Broken. One composed of different successive straight lines.
Mixed. One of straight and curved lines.
Center. A line used to indicate the center of an object.
Construction. A working line used to obtain required lines.
Dotted. A line composed of short dashes. - - - - - -
Dash. A line composed of long dashes. — — —