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B. Isometric Cross Section Paper.

A drawing on isometric paper combines the principles of mechanical and perspective drawing. The principal lines are drawn vertically, horizontally, and 30 or 60 degrees to the horizontal. As a result all parallel lines of an object are drawn parallel and three faces of the object are shown.

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Three-Dimensional Model Showing the Growth of the Population of Sweden from 1750 to 1875.

The picture of this model which appeared in the Journal of the Royal Statistical Society of London was in a brown half-tone with black, red, blue, and j-reen lines. The three dimensions are the years from 1750 to 1875, the number of persons, and the age of the persons.

In this book, an illustration occupying a full page is referred to by page number. When there is more than one illustration on a page, each is identified by a letter of the alphabet. When there is more than one footnote beneath an illustration, each is numbered. Thus the cross reference 267B2 means page 267, illustration B, note 2.