Comparison of the Salaries of the Professional Staff of the National Bureau of Standards in August 1928 With the Salaries of Persons Holding the Same Type of Position Outside the Federal Service.

The 5 curves labelled as follows: "lower boundary of maximum 10 per cent," "lower boundary of maximum 25 per cent," "median," "upper boundary of minimum 25 per cent," and "upper boundary of minimum 10 per cent" refer to the distribution of persons in a similar occupation outside the Federal Service. Only the heavy line represents salaries in the Federal service, as indicated by the key.

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FREQUENCY CHARTS

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A. Distribution of the Causes of Accidents in Hartford, Conn.

Compare this method of showing the distribution of the causes of accidents with that used in 190A.

Travelers Insuranrr Co . Hartford. Conn Burni. "The Decline of Competition." McGraw-Hill, 1936 (Source: Federal Trade Commitsion Price Baies. Inquiry). SCALE .7

B. Net Yields on the Sale of 2.350 Carloads of Cement to Five Minneapolis Line Lumber Companies at 2 1 0 Destinations in Minnesota, Iowa, and North and South Dakota Between July I, 1927 and June 30, 1929.

1. Each dot represents one carload of cement. Dots in the area marked "one price system" represent sales at prices yielding to the mill its "then current maximum mill net price."

2. Dots in successive outer zones represent sales yielding less than the mill's maximum

mill net by an amount within the range of cents indicated within each zone on the chart. The guide for cents per zone is shown in the South Dakota section.