48 
BULLETIN 102, UNITED STATES NATIONAL MUSEUM. 
MONTHLY DEMANDS FOE GAS HEATING SEEVICE. 
When the atmospheric temperature drops below 70° F. demands 
for heating service are created which are practically proportional to 
the number of degrees that the atmospheric temperature is below 70. 
The variation in monthly demands for each degree of atmospheric 
temperature below 70° F. is shown in the following table. 
The data in column D is the estimated gas consumption for cook- 
ing, incidental hot water heating, and lighting, which is entirely 
independent of the atmospheric temperature, and the estimated figure 
is taken approximately as the total amounts delivered during the 
months of June, July, August, and September, when there are prac- 
tically no demands for heating service. 
The average of the demands for heating service at Louisville, Ky., 
for each degree below 70° F., for the months of January, March, 
April, May, October, and November, 1917, and March 1918, when 
enough gas was available to meet the demands, was 5,500,000 cubic 
feet for each month for each degree below 70° F. 
Monthly gas heating consumption for each degree below 7 0° F. 
Date. 
Mean 
monthly 
tempera- 
ture of 
atmos- 
phere, in 
degrees F. 
(A) 
Difference 
between 
mean tem- 
perature 
and 70° F., 
70- A. 
(B) 
Million cubic feet natural gas a month. 
Delivered 
to 
Louisville. 
(C) 
Service 
independ- 
ent of 
atmos- 
pheric tem- 
ature. 
d>) 
Heating 
service 
(C-D). 
(E) 
Demands 
for heating 
service 
per degree 
below 70° F. 
(E+B). 
(F) 
1917. 
January 
35 
34 
302 
140 
162 
4.8 
February 
32 
38 
260 
140 
120 
3.2i 
March 
46 
24 
260 
140 
120 
5 
April 
55 
15 
232 
140 
92 
6.1 
May 
60 
10 
204 
140 
64 
6.4 
June 
72 
140 
July 
76 
131 
August... : 
76 
134 
i ;;;;; 
September 
69 
149 
October 
51 
19 
243 
140 
103 
5 
November 
45 
25 
270 
140 
130 
6.2 
December 
26 
44 
269 
140 
129 
2.9i 
1918. 
January 
20 
50 
263 
140 
123 
2.4i 
February 
38 
32 
223 
140 
83 
2.51 
March 
51 
19 
232 
140 
92 
4.9 
Average of normal months. 
| 
5.5 
1 
1 Not enough gas available to meet demands. 
WHY STANDARDS FOR NATURAL GAS SERVICE MUST BE LOWER THAN FOR MANUFAC- 
TURED GAS. 
The operating conditions in a natural gas plant are so different 
from those prevailing in a manufactured gas plant that the standards 
of service that would reasonably be applicable to the latter would not 
be feasible or expedient with natural gas, because ; 
