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Automotive Industries, March 23, 1922. A. The Effect of "Doped Fuels" Upon fhe Fuel System of an Engine in the Presence of Moisture.

Here again a block chart is used to present a gradation classification. It is based on the results of an investigation made by the Material Section of the Engineering Division, War Department, Air Service, McCook Field in Dayton, Ohio. It may be observed that the metals which stood up better than the others are aluminum and zinc plate.

Standard Statistics, Inr , N. Y. C. SCALE .9

B. Raw Material Resources of the Leading Countries of the World in 1936.

1. The value of this type of chart is that a quantitative analysis which is not actually

shown on the chart can be compared with other analyses. That such an analysis was made is shown in the titles of the four classifications at the bottom.

2. Compare this chart with 51.

CLASSIFICATION CHARTS

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