Graphic Methods for Presenting Facts
GRAPHIC METHODS
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drawn that the line at the right of the
1910 card was above , zero, and the joint hne at the left of the
1911 card at the bottom of the ruled field. Thus, when the two cards are overlapped so that the joint lines match, it is seen that there is enough space in the ruled field at the right for the curve to rise to the scale line for 1,600. Two more spaces were again allowed in 1912 in anticipation of even further upward progress in the curve. As joint lines may be drawn in continuation of any horizontal line on either the upper or the lower card, any amount of expansion in future years may be provided for. The curve cards are small enough to be very convenient to handle and yet they may be joined together in such a way as to provide for unlimited future growth.