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In absolute figures, there is a frequency range from 399 accidents between 6 and 7 A.M. up to a peak of 11,810 accidents between 10 and 11 A.m.; from this time there is a downward movement, showing a low mark during the noonday period of 3,345; between this time and 3 and 4 P.M. there is another rise, which reaches a peak of 9,989 accidents for the afternoon. (Table VI.)

The hours of the day at which fatal accidents occur do not show the same steady rise and fall as appear in the figures for non-fatal accidents, but the peaks in this group of accidents correspond with the morning and afternoon modes for non-fatal accidents. The following table shows the hourly frequency of fatal accidents (Table VII.):

Frequency of Fatal Accidents by Hours of the Day.

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Diagram 4 shows the relative number of non-fatal accidents by days of the week. Except for Saturday and Sunday, when a smaller number of employees are working, the daily frequency of accidents is very steady, as shown by the curve which approaches a straight line. (Table VI.)

The same study made for fatal accidents shows results approximately identical with those found for non-fatal accidents. (Table VII.)

Diagram 5 represents the relative monthly frequency of nonfatal accidents. The percentage of accidents for each month is plotted out from the center of the circle on the monthly radii. The regularity of the figure formed by joining these

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