Graphic Methods for Presenting Facts
It will be noticed, in Fig. 208, that the cards are overlapped in such a way that the right-hand edge of the uppermost card coincides with the left-hand edge of the ruled field of the lower card, and that the zero line is continuous. The extension line drawn at the left of any lower card shows where the extension drawn across the right margin of the upper card is to be joined. Cards may be laid together in a horizontal position almost instantly, and correctly, when these joint lines are present as a guide.
If, as in Fig. 211, a curve should rise with such rapidity as to be dangerously near the upper limit of the ruled portion of the card, the joint lines may be so drawn as to allow more vertical space on the succeeding cards. In Fig. 211 the curve for 1910 indicated that the curve for 1911 might go higher than the 1,400 line. Consequently, when the new card was made out for the year 1911, the joint lines were so
GRAPHIC METHODS
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