Cased Instruments, ContinuedProportionalProportional dividers transfer measurements from one scale to another anddividersdivide lines and circles into equal parts. They consist of two legs of equallength joined by a moveable pivot. This pivot is a rack-and-gear movementsecured by a thumb nut. There is a series of scales on the divider faceranging from 1 to 11.5. Divider points are made of hardened steel.Protect divider points when they are not in use. Keep the dividers clean andwipe them with a light oil cloth after use, Do not oil the movement onproportional dividers.Figure 2-19 shows a set of proportional dividers.Figure 2-19. —Proportional dividers.DividersUse a set of dividers to step off equal distances, to transfer measurements, orto divide a line into equal lengths. Dividers have two legs of equal lengthterminating in needlepoints. Above the needlepoints is a hinge to help the legmaintain perpendicularity with the drawing surface. Dividers are joined atthe top.Figure 2-20 shows a set of common dividers.Figure 2-20. —Common dividers.Continued on next page2-20
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