On the fire map the height of the multi-story loft buildings in which the difi^erent factories may be found is indicated by using one bead for each floor. Thus, in some of the taller buildings, twenty stories are indicated. Different colors of beads according to the fire risk or the sanitary defect to be shown mark the stories very plainly, and the heights of the bead columns show the heights of the buildings so that the bead map itself represents in miniature the sky line so typical of Manhattan Island.

Bead maps carefully made up should be of great use in preparing illustrations for advertising purposes. The accuracy of a bead map, when data for different cities must be shown, is much greater than that of a map on which only pins are used. The bead map makes possible the giving of information in condensed form with that great clearness and accuracy necessary to good advertising. It can safely be predicted that pictures. of bead maps will in the future be a common thing in the advertising pages of magazines.

Chapter XIII CURVES FOR THE EXECUTIVE

WITH the exception of the railroads, there are relatively few businesses which make a practice of plotting curves to show operating records in convenient form for the use of executives. Railroad accounting is more highly standardized than accounting in industrial corporation work. The standardized method of accounting has made it rather easy to compare the operating records of different railroad divisions and of different railroad systems. It is probably for this reason that railroads have adopted the use of curves for operating records so much more extensively than have industrial or mercantile businesses.