The actual differences between the two operators would show more clearly, operation by operation, if lines were used joining the ends of the components in the two bars in a manner similar to that seen in Fig. 32. The data of Fig. 85 do not lend themselves well to presentation in curve form. In Fig. 85 and in Fig. 86 the shape of the curves means nothing, since there is no numerical scale relating to the names of operations. Fig. 87 shows a much more satisfactory method for portraying the data.

In Fig. 88 we have an application of curves to advertising in popular magazines. The curves depict the circulation of a newspaper,

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