96 Chapter 5
Dimetric Projection.
Dimetric projection is an axonometric projection of an object placed in such a way that two of its axes
make equal angles with the plane of projection and the third axis makes either a smaller or a greater an-
gle. In dimetric projections, the directions of viewing are such that two of the three axes of space appear
equally foreshortened, with the attendant scale and angles of presentation determined according to the
angle of viewing; the scale of the third direction (vertical) is determined separately. Approximations are
common in dimetric drawings. Figure 5.22 shows different arrangements for isometric, dimetric, and tri-
metric drawings.
Trimetric Projection.
Trimetric projection is an axonometric projection of an object so placed that no two axes make equal an-
gles with the plane of projection and each of the three principal axes and the lines parallel to them, re-
Figure 5.19 The four steps in drawing a simple 5-inch box in isometric. Note that all lengths are actual size in
standard isometric drawings.