Graphic Presentation
\wire coiled filament gas filled
Average cost of lamp 75(t
Due to greater manufacturing precision
Due to research
Ol I I I ' ' ^ ' I I I I I I I I '
J I I I'll
-- -- -- -- -- oldr^ccJ
CM •* vD ao »0 ro Kl to
0> <J> O o>
Product Engineering. October 1938. Part of an Editorial on Public Relations Entitled "Research in America -- the Key to Belter Living "
B. The Effect of Research on the Price and Quality of Light From 1904 to 1938.
Supplementing the information given here with further details, it is estimated that if the iillumin«tion of 1937 had been attempted with the lamps of 1900, it would have cost two billion dollars more for electricity alone at present power rates.
GRAPHIC PRESENTATION
i
<
V 5
<
^ 5
CO jT^
Ul I--
<1
^1
^■-
«
\ •
*
m
S I
u
5 p
^
o ^
z
^
1 *
^
^ i
i ^
\ \
o
oo
O 5
c ^ *-
-D
0)
*^ 2
„ c ■^
- o
O cs
UL a
u.
a
r/1
a>
h o
o
c
en
c
a
J=
u
o
x:
■*^
t/3
o
1.
o.
a.
J=
c
1.
•o
«
^ oo
c ^
0) u
Z. C/3
0)
CURVE CHARTS
A. Cost of Rubber Per Pound in New York From 1838 to 1937.
When data over a long period of time is plotted in curve form, it is usually necessary to allow a great deal of space horizontally, or to condense the years so that a trend only is indicated. This method of breaking a series of years into four parts solves both these difficulties.