2. The addition of the actual amounts

which each bar represents would facilitate the reading of the chart and aid in its use for reference purposes.

V ■vr.M - '/noooooto

■t?ff. n Prrcfnt Iron *w Sfff ' 'Xf6. 900. 000

as ftrrctnf

><>.-« ^ryt^Ji 700 000

7 flrrcenf

'-^3fxyftfw r^ifyryw' - 'Og 10(1000

l95Plrrcmt

/»nw«m«w - 'fSd, 000.000

U. S. Department of Labor. Bureau of Labor Statiitics, "Labor Information Bulletin." October, 1936. SCALE .8

B. Value of Orders Placed for Materials Used on PWA Projects for the Period 1933-1936.

1. The total of the lengths of all the bars

beneath the first one is equal to its length.

2. It should be noted that there is no

difference between the width of the "total" bar and the others.

MULTIPLE BAR CHARTS

WPA. "Report on ProgrcM of the Works Program." December, 1937. SCALE .7

A. Estimated Total Cost of Works Progress Administration Projects Placed in Operation from May 6, 1935, Through September 30, 1937.

1. The material here is arranged arcording to the magnitude of the bars.

2. Its presentation horizontally eliminates the possibility of the eye seeing a curve which

would be undesirable.

3. Since stubs only are used in the vertical rulings, it might have been better to include

actual figures to facilitate reading the chart.

$ PER UNIT

♦ 702

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DEC. I9S7

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1S79^

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