It would be desirable to have a large number of the illustrations in this book printed in color. Charts which are made in color can readily bring out points which are not easily portrayed when only black ink is used. The reader should keep in mind for his own work that he should use colors in making those charts where colors are economically possible. For the purpose of this book, color printing is prohibitive

Disposition of the Gross Revenue of the Bell Telephone System for the Year 191 1

This chart was taken from the annual report to the stockholders of the American Telephone and Telegraph Company for the year ending December 31, 1911

The circle with sectors is not as desirable an arrangement as the horizontal bar shown in Fig. 1

GRAPHIC METHODS

on account of the cost. In printed reports, in magazine articles, and in magazine advertising, color printing is not at the present time commonly available. The illustrations of this book will accordingly show what can be done in printing complex charts with only one color of ink,

under the same conditions that would be found in the preparation of material for magazine articles, printed reports, and ordinary prospectus or other advertising matter.

Fig. 2 is a form of chart used probably more widely than any other form to show component parts. The circle with sectors is not a desirable form of presentation, however, because it does not have nearly such flexibility as the method shown in Fig. 1. The sector method does not permit of convenient arrangement of names for the different