Scales measure increments. The most common shaped scales are the
triangular, two-bevel, opposite-bevel, and four-bevel. They vary not only in
shape, but in style, division, and type. When properly cared for, scales will
last a lifetime. Never rap a scale on a table or hard edge. Do not cut or
draw lines against the machined increments of a scale face.
Figure 2-55 shows the most common scale shapes.
Figure 2-55. Common
Triangular scales provide six scale faces on one rule. Each scale face is
double numbered except for the 16 scale which stands alone. This gives the
DM eleven scales with which to measure. The triangular scale is convenient
for most drawings. Some triangular scales have scale clips to identify the
scale in use. Scale clips also ensure that the correct side of the scale is
against the drawing surface. Large paper binder clips are a suitable
substitute for scale clips.
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