It should be noted that the 192 7 circle follows the general rule and establishes the arrangement of shadings which is adhered to in the other circles.

SECTOR CHARTS

MIDNIGHT

A. Comparison of Crimes Against Persons By Time Periods in Cincinnati in 1937.

This is a comparison of areas rather than angles as can easily be seen by comparing the section labelled 18.3% with 9.9%. a ratio of about 2 to 1. The distance along the radius for each does not appear to be as 2 is to 1.

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Cincinnati, Ohio, "Municipal Activitiet." 1037.

SCALE .5

Carpantsr

HOURS WORKED A.M. ,1 J^i P.M.

HOURS WORKED A.M. uJL\ PM.

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Common Laboror

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Shovel Operator

Engineering New* Record, October. 1938. Part of an Editorial on Public Relations Entitled, "The Construction Industry, What It Is -- What It Does." SCALE .9

B. A Comparison of the Hours Worked in New York City on Various Construction Jobs in 1888 and 1938.

The average number of hours worked in each of the two years, 1888 and 1938, is actually plotted on a clock so that not only the number of hours but the time of day involved can be seen. For instance, in 1888, an hour was allotted for lunch. In two categories in 1938 only half an hour is allotted for lunch.

GRAPHIC PRESENTATION

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Leonard P. Ayrci. "The War With Germany," Government Printing OflFice, 1919.

A. Deaths of American Soldiers by Principal Diseases in the World War.