Engraving and printing methods, advertisement illustration, technical- and trade-paper advertising, street-car advertising, outdoor advertising, house publications (1909)
Scranton : International Textbook Co. · leaf 292
tant from the center; they therefore balanceeach other in the composition. In Fig. 54, the spots are ofdifferent shapes, but are of equal value in light and shade;therefore, being equidistant from the center, they balance.In Fig. 55 are shown three spots, two of which are each half the size of the… … (a)
