Frequency charts are sometimes made for popular illustration by drawing vertical lines to represent the number of individuals found in each class designated by the horizontal scale. Thus, a representation could be made for the data of Fig. 141 by having a horizontal scale to represent heights, and drawing vertical lines to a scale by, which the length of each vertical line or bar would represent the number of individuals of that particular height. The series of bars would then have the same general arrangement as the

NUMBER OF PERSONS WORKINGON ANDABOVETHE S

Cloak and Suit Industry Dress and Waist 1

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IXTH FLOOR

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J aim hoard of Sanilaru Control, New York City

Fig. 142. The Number of Persons Working On and Above the Sixth Floor in the Cloak and Suit Industry and the Dress and Waist Industry in New York City

This chart was made first for a wall exhibit and was later used in a widely distributed report. The co-ordinate ruling has the shape of a New York manufacturing building. By observing this illustration from the left edge of the page the reader may get the general effect of a frequency curve