In Fig. 193 a map was used in which there was more detail than really necessary or desirable for a clear illustration. In justice to the General Electric Review it must, however, be said that the map shown in Fig. 193 has been reduced in size and made smaller than it was in the original print. This map could not be reduced further without danger of completely losing the pin heads in the gray background resulting from so many lines on the map.

In producing an illustration like Fig. 193 considerable ingenuity must be used to make two or more classes of pins show out distinctly in zinc cuts which can be printed in only one color. The pins on the

LOCATION OF

■r V OF 1000 HP. AND OVER

Ss POWER

SECTIONS OF STREAMS

ijgi*- IN THE

: • Commercial Developments :-; ■ Manufacturing Developments 2 Heavy line {-y^for Stream. indicates T^Vyou^hly'Sectian having power.

General Electric Review

Fig. 193. Location of Water-Power Developments of 1,000 Horse Power, and Over, and Power Sections of Streams in the United States

The original of this map would have pins in two different colors. The photograph taken from the map would be retouched by the use of a pen so that squares would replace dots for one of the two colors of pins. The illustration shows a contrast of dots of two shapes rather than dots of two colors

GRAPHIC METHODS

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