Special Cased Instruments, ContinuedCenter disksCenter disks prevent the enlargement of a hole when concentric circles andarcs are drawn. They are usually very small with a transparent center andthree needlepoint legs for holding a position on the drawing surface. Positionthe center disk carefully on the drawing surface, place the compass needleinside the center of the disk, and rotate the compass to draw concentriccircles.Figure 2-37 shows an enlargement of a center disk.Figure 2-37. —A center disk.2-31
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