DRAWING INSTRUMENT SETS So far we have discussed only those
instru-ments and materials that you will need for drawing
straight lines (with the exception of french curves). Many
drawings that you will prepare will require circles and circular
arcs. For this purpose, instruments contained in a drawing
instrument set are used. Many types of drawing instrument sets
are available; however, it is sometimes difficult to judge the
quality of drafting instruments by appearance alone. Often their
characteristics become evident only after they are used. The
drawing instrument set shown in figure 2-15 is typical of those
sets found in the standard draftsman kit. The following sections
describe these instruments. Some special-purpose instru-ments
not found in the set will also be described. They may be
purchased separately or found in other instrument sets. Circles
and circular curves of relatively shortradius are drawn with
COMPASSES. The large pivot joint compass (fig. 2-15C) is
satisfactory for (fig. 2-15K and 2- 15L).