ScalesIntroductionScales measure increments. The most common shaped scales are thetriangular, two-bevel, opposite-bevel, and four-bevel. They vary not only inshape, but in style, division, and type. When properly cared for, scales willlast a lifetime. Never rap a scale on a table or hard edge. Do not cut ordraw lines against the machined increments of a scale face.Figure 2-55 shows the most common scale shapes.Figure 2-55. —Commonscale shapes.TriangularTriangular scales provide six scale faces on one rule. Each scale face isscalesdouble numbered except for the 16 scale which stands alone. This gives theDM eleven scales with which to measure. The triangular scale is convenientfor most drawings. Some triangular scales have scale clips to identify thescale in use. Scale clips also ensure that the correct side of the scale isagainst the drawing surface. Large paper binder clips are a suitablesubstitute for scale clips.Continued on next page2-47
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