46 Chapter 3
Phantom Lines.
Phantom lines are thin, dark lines that consist of a long dash and two short dashes. They look like cut-
ting-plane lines except that they are lighter. Phantom lines are used mainly to show alternative positions
of fixtures, movable partitions, motion (e.g., alternative door swings) or future construction additions (as
well as existing structures to be removed). They are also used to indicate repeated details and materi-
als prior to machining.
Leader Lines and Arrowheads.
Leader lines are fine lines terminating with an arrowhead or dot at one end to relate a note or callout to
its feature. They are often drawn at an angle or straight from the principal lines on the drawing or in a
free-curved manner to distinguish them easily from object lines.
Leader lines are used to label elements by connecting an object to a note or abbreviation or a di-
mension to the object it represents on a drawing (Figures 3.8A, B, and C).
Figure 3.6 Extension lines are typically used for dimensioning.