When more than one curve is put on a grid, it is necesary to make some differentiation

between the curves. A dotted line is one solution.

2. The grid of a chart may be omitted to great advantage in some cases. Since the

omission often hinders the reading of the chart, the practice should not be encouraged.

GRAPHIC PRESENTATION

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I9t« 19*7 19*8 1999 I9M> 1991 t93t 19SS »9S4 I93S 19S6 1997

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Annual Review Number of Iron Age Magazine, January 6. 1938.

SCALE .7

A. Comparison of the Record of Automobile Production and Steel Ingot Production in the United States from 1926 Through 1937.

1. If this material had been plotted on a grid with one scale, it would have resulted in

too large a chatt. When a common grid is thus used for two scales, care should be taken to put the zero of each at a common starting point.

2. Note the lag of the automobile curve as compared with the steel ingot curve.

THOUSAND OOUARS

High and Low Pric* of a Membership on th* N. Y. Stock Exchange, 1900-1937