figure 5.15, the drilled hole that is visible in the top-side view
is hidden in the front and right side views, and there fore it is
indicated in these views by a dashed line showing the hole
and the shape as left by the drill.
Figure 5.15 Examples of objects having hidden surfacesParticular attention should be paid to the execution of these
dashed lines. It carelessly drawn, they ruin the appearance of
a drawing. Dashed lines are drawn lighten full lines, of short
dashes uniform in length with the space between there very
short, about ¼ of the length of the dash.
This view shows the shape of the object when viewed from
the side and the distance from bottom to top and front to rear.
The horizontal and profile planes are rotated in to the same
plane as the frontal plane. Thus, related in the same plane,
they give correctly the three dimensional shape of the object.