Elements of descriptive geometry, with applications to isometric projection and othe forms of one-plane projection; a text-book for colleges and ingineering schools by O. E. Randall.

SUPPLEMENTARY PLANES OF PROJECTION 27
Fig. 37 shows how the projections of Fig. 36 will appear after
the planes H, V, and P have taken their position of coincidence.

FIG. 37

J-# II~~~~~

np,:
IN

-/ - ----- -----
-------------------------- ---
FIG. 38

P

mp'
mp,
P'

Fig. 38 shows the projections upon H, V, and P of a straight
line M-N running from a point in the fourth quadrant to a point in
the second quadrant.
Fig. 39 shows the projections upon H, V, and P of a straight
line M-N in a profile plane.