It also shows that since numerous accounts are being closed, the loans are being made to other employees rather than being repeated continually to the same employees.

Fig. 138 is a study made to determine the size of tank necessary to supply sufficient boiler-feed water for a number of locomotives and tugboats. The average amount of water used each day by all the locomotives combined is given in the lower cumulative curve. The shape of the curve shows that locomotives fill their tanks chiefly between six and nine o'clock in the morning and between five and

OolloMa

CUMULATIVE CURVES

li)

oo

12.0,000

^

/

1 IS. 000

^

^

y

I.

(^

^

-J-

»Oo.OOO

yl

y

/

^

h

*•"'"'

y

.

i

u

,

,

_,

Qo^oo

.-'■'.

>

/

/

ly^ooo

n-^'H

y

/

<'

y

,<*<^

tr"

-^

p^\

^

/

A1

^^

- 1 ;^

i«_

■OfcOtpOTtVI

r^

'^-

f^

#*-

=^-.-^

r-

^

i?^

/

/

•*Wl,ooo 35,000

t-»-

-•-

-•

1^

\

t^O

=r^-

/*

^

v:

'"

. ^

-^

^

-e

iB,ooo

'^

Ln

:ru££j

10,000

5.000

r

/

^

=°^

ia--

-•-

-*--

r

£

■

>

*

s

n.

3 ■*

s >

« I

a

z. :

> ^

P.

a s 10 •>

r;

Fig. 138. Cumulative Curves Plotted to Determine the Minimum Size of Tank and the Minimum Steady Flow of Water Required for a Group of Locomotives and a Group of Tugboats Taking Boiler-Feed Water from the Same Source of Supply