THERMAL EFFECTS OF FLUIDS IN MOTION. 
327 
quantity of air propelled by the pump through a more porous plug. The cylinder of 
lime was employed. 
Table IV. — Experiments in which a smaller quantity of air was passed 
through a plug consisting of 580 grains of silk. 
1 . 
2. 
3. 
4. 
5. 
6. 
7. 
8. 
Number of obser- 
vations from 
which the results 
in Columns 
4, 6, and 7, 
are obtained. 
Cubic inches 
passed through 
the nozle 
per minute. 
Water in 
100 grains 
of air, in 
grains. 
Pressure in lbs. 
on the square 
inch. 
Atmospheric 
pressure. 
Temperature of 
the bath. 
Temperature 
of the issuing 
air. 
Cooling 
effect in 
Cent, de- 
grees. 
10 
3071 
0-18 
33-168 
14-727 
18-882 
18-524 
0-358 
10 
Not observed. 
0-18 
33-024 
14-732 
18-884 
18-536 
0-348 
10 
Not observed. 
0-14 
33-820 
14-660 
19-066 
18’686 
0-380 
10 
Not observed. 
0-14 
33-226 
14-650 
19-068 
18-695 
0-373 
Mean 
0-16 
33-309 
14-692 
18-975 
18-610 
0-365 
Table V. — Experiments in which the entire quantity of air propelled by the pump 
was passed through the silk plug. The cylinder of lime was employed in all 
excepting the first two experiments. 
1. 
2. 
3. 
4. 
5. 
6. 
7. 
8. 
Number of obser- 
vations from 
which the results 
in Columns 
4, 6, and 7, 
are obtained. 
Cubic inches 
passed through 
the nozle 
per minute. 
Water in 
100 grains 
of air, in 
grains. 
Pressure in lbs. 
on the square 
inch. 
Atmospheric 
pressure. 
Temperature of 
the bath. 
Temperature 
of the issuing 
air. 
Cooling 
effect in 
Cent, de- 
grees. 
10 
7594 
0-40 
53-722 
14-580 
17-585 
16-903 
0-682 
10 
Not observed. 
0-40 
53-530 
14-580 
17-628 
16-954 
0-674 1 
10 
Not observed. 
0-32 
53-317 
14-563 
17-993 
17-318 
0-675 \ 
10 
Not observed. 
0-32 
53-317 
14-563 
18-027 
17-357 
0-670 | 
10 
7742 
0-11 
55-797 
14-615 
17-822 
17-063 
0-759 | 
10 
Not observed. 
0-11 
54-074 
14-611 
17*813 
17-079 
0-734 
10 
Not observed 
0-11 
55-720 
14-608 
17-808 
17-082 
0-726 
10 
Not observed. 
0-11 
56-174 
14-605 
17-796 
17-058 
0-738 i 
Mean 
0-23 
54-456 
14-591 
17-809 
17-102 
0-707 I 
In order to obtain a greater pressure, a plug was formed of silk “ waste ” com- 
pressed very tightly into the nozle. 
