The vertical scale of Fig. 173 should have been shown on the chart. The heights stated for different cities give a fair indication of what the vertical scale is and a reader can, if he must, measure on the drawing the height for any city and from that determine to what scale the drawing has been made. As a broad rule, the scale should be indicated in an easily seen position on every chart, if the scale can be of assist-

Fig. 170. The Comparative Size of the \^^*^ ^« ^^^ °^^ ^^^'^^^ ^^^ ^^^^^^ Philippines of the chart.

By drawing the islands to scale and in solid black Considerable time and ingCUU-

on a map of the eastern part of the United . i • i •

States, the relative size is clearly brought out ity may be UScd lU drawing Up a

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GRAPHIC METHODS

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Boston Globe

Fig. 171. Second Half of the Harvard-Yale Football Game, November 23, 1912,

Final Score, Harvard 20, Yale

The scale of the football field has been changed so as to give sufficient width for representing the plays by

lines and symbols of various kinds

MAP PRESENTATIONS

chart like Fig. 174 so that the facts which it is desired to prove may be brought out clearly . Numerous methods are available for presenting such data. There is no general rule for determining which method is the best, and judgment must be used to choose the method w^hich is best fitted to each individual case. Note that in Fig. 174 we have a scale reading to quarters of a mile, and we also have circles prominently drawn on the map at one-mile intervals to give a clear idea of the distances involved.