Graphic Methods for Presenting Facts
Another disadvantage of the method of steps with flat tops as compared with the method using slanting lines and peak tops, is seen when two or more curves are so drawn that they intersect on the same sheet of co-ordinate paper. Curves plotted with peak tops can be drawn very close together and yet be fairly distinct from each other, as will be noticed in many of the illustrations in this book. If, however, two curves with flat tops hke those shown in the upper portion of Fig. 202 are plotted in such manner that they intersect each other, the re-
GRAPHIC METHODS
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JUNE
JULY
AUG.
SEPT
OCT.
NOV.
DEC.
TOTAL COST
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<yy- 31
^h ts
66 88
8-^ f/
77 29
7S 5J
82 /S
60 7 7
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NO.OF TONS
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W-Otf
1^33
JZiS
n-JZ
J 70
V-9S
i^v-S
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J8i>
S-T^
COST PER TON
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./78
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ass
K -275
O .250
gg .225
gtt .200
Z fe i50
o ,o ,oo
^ liJ .050 -'°- .025
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Courtesy of Factory
Fig. 203. Lubrication Cost per Ton of Product for a Factory in the Year 1908
The figures at the top of the co-ordinate ruling give the data from which the curve was plotted. Though data should be put on all charts, figures arranged in the direction here shown are not in convenient form for addition. See the later illustrations in this chapter for methods of placing figures above each point