Though weather conditions have affected the curves quite largely, we can see, by comparing the curves for 1910 and 1911, that probably conditions of management as well as weather conditions caused smaller shipments in November and December, 1911, than in those same months of 1910, when shipments were quite good. The card for 1912 is shown with the curve incomplete, just as the manager might have seen it early in the month of February, 1912, after the January reports had been received, tabulated and plotted. As Fig. 207 shows curves which are true records of the real happenings in an automobile plant, they are worthy of study for practice in curve interpretation. Notice that the changes from July to August, in 1911 and 1912, are readily seen because each curve card begins by repeating the record

GRAPHIC METHODS

26*78

So-tes -Toto.* XYZ Ao-*omobae

J 1

^ t i

gt M oS. t-' (DO' v' Ji "O - "ovOfir>jo-iniii U _, _ - _ -

T=lartts

PS?

m O (K (D ri in ^

is n

s i

n

; 3eo^ooo

V/i 2.40,000 •& %IO.OOO S* O ISO.OOO ■);j- ISO.OOO

■5? J20.000

^ 90,000 c &o,ooo I 3o,ooo

^

._

\

/"

-- "

S.

/

„-•

^-

-^

r 8 9 10 II 18 1 2 3 4 5 6 7

^ Zio.ooo ^ ?<ao,ooo -^ ^10,000 1 80,000 ■J Q 190,000 ^ iZo.ooo ■J 90,000 c 60,000 ■| 3o,eoo ^

^

/

*"

S^

y

r

^

^-^

^^