Maps on which large areas as States, or counties, are differentiated by the use of colors red, orange, green, etc., do not produce either good line cuts or good half-tones since the colored areas on the original maps are likely to show as solid black areas and blot out all detail on the photograph. If an illustration must be made from a map it is well to be sure that the map is printed in black, red, or orange outline so that the resulting photograph will have distinct contrast. Maps should contain as little detail as practicable, to make certain that the pin heads or other representations of specific data will show up as distinctly as possible. Fig. 192 is a good example of the kind of map to use for reproduction when pins are employed. Notice in Fig. 192 a heavy border for the country as a whole, and the outlines for each State. Towns and rivers are not shown. Each dot on the map may thus be seen with great clearness.

As maps are very carefully copyrighted by most map publishers, maps which are copyrighted should not be reproduced without consideration of the copyright. For maps which are photographed down with comparatively little change, permission should be requested from the map publisher, to make certain that unpleasant complications such as damage suits or the holding up of a publication may be avoided.

GRAPHIC METHODS

The 228 Principal Trading Centers

Saturday Emning Post, Curtis Publishing Co.

Fig. 192. The 228 Principal Trading Centers in the United States