A Comparison of the Percentage of Sales of Five Types of Motor Coaches in the United States from 1929 to 1937.

1. The total of the percentages which the lines represent is one hundred.

2. One way of differentiating a large number of curves plotted on one grid is shown here.

3. It might have been better to connect the labels to the lines with arrows, eliminating the

necessity for putting them at an angle.

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COMPARISONS WITH CURVES

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Pcdrral Rcifrve Bank of New York. Monthly Review." July 1. 1937. SCALE .6

A. Daily Average Production of Passenger Automobiles and Trucks in the United States in 1929, 1932. 1936. and 1937.

1. By using a monthly scale, the curves

for several years may be plotted on the same grid with clearness and a saving of space.

2. When letters only are used to indicate

the months of a year, by noting the position of JASON in the line, it is easy to determine whether the year begins with January or June.

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Federal Reserve Bank of New York, "Monthly Review." April 1. 1937

B. Money Rates in the New York Market from 1931 to 1937.