Figure 2.15. There is a horizontal line which represents frequency. The left end is labeled F = 0. A point a little to the right is labeled F. To the right of that and twice the distance from 0 to F is a point labeled 3F. The same distance to the right is another point labeled 5F. On to the right are 7F, and 9F. There are vertical lines above each point except F = 0. The line at F is a certain length. The line at 3F is one third the length of that at F. The line at 5F is one fifth the length of the line at F. Similarly the lines at 7F and 9F are one over 7 and 1 over 9 of the length of the line at F. This drawing was carefully drawn to scale. End verbal description.
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