Microsoft Word - lecnote_fm_engineering drawing

parallel to the profile view) it appears as a point views in the
frontal view and true length in the profile view and is a
combination horizontal and profile line. Likewise, if a
horizontal line is parallel to the frontal plane it appears as a
point view in the profile view and true length in the frontal view
and thus is a combination horizontal and frontal line.

Figure 7.9 Horizontal lines

In order to tell if a line is in or parallel to the horizontal plane, it
is necessary to have either the frontal or profile views of the
line. Only the frontal and profile views show the line as a point
view or parallel to the horizontal plane.