Page:Graphic methods for presenting facts (1914).djvu/375

 Fig. 250. The Number of Subscribers' Stations Connected to the System of the Bell Telephone Companies, December 31st of Each Year

The curve permits quicker and more accurate interpretation than the vertical bars but unfortunately curves are not readily understood by as many people. Note that the date on which the telephones are recorded is here specified as December 31st instead of as January 1st. Compare Fig. 251