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.

THREE-DIMENSIONAL METHODS

A. Triangular Coordinate Graph Paper.

The trilinrar chart was fust used for invrstigation on strength of concrete mixtures. This form lends itself to the demonstration of problems involving a mixture of three ingredients, such as alloys containing three metals and food rations containing three dietetic elements.

Krufffl (k Ejifr Co , N Y.

v(Oiopside)

*PDt«s?i Feldspar (PolaihTeWspar) WT. PER CENT

«»7*

17/3"

J F Sfhairrr and N L Bowcn. 'Thf SyHrm. Lruritr -- Diopiidc -- Silica." Amfrican Journal of Scicncr. IQ38 Groi>hy«ical Laboratory CarnrRif Institution of Washington

B. Equilibrium Diagram of the Ternary System, Leucite -- Diopside -- Silica.

Chapter 43 COMPOSITE CHARTS

Jb o present a more complete picture it is often desirable to combine several different types of charts. The charts in this chapter illustrate different methods of combining various charts.

NET INCOME IN MILLIONS OF DOLLARS

z - «

li

m -

too

1975 197b 1977 1978 1979 1930 1911 1957 19JJ 1914

NET INCOME OR 1978 1979 I9J0

NET INCOME OR DEFICIT |