364 PROFESSOR W. THOMSON AND MR. J. P. JOULE ON THE 
Suspecting that particles of the sperm oil employed for lubricating the pump were 
carried mechanically to the cotton plug and interfered with the results we now sub- 
stituted a box with perforated caps, filled with cotton woo for the “ 
the last series. With this arrangement the pressure was kept as uniform as with 
other, and all solid and liquid particles were kept back by filtration. 
Third series of experiments. Atmospheric air dried and deprived of 
by quicklime*, and filtered through cotton. Gauge 737 i thermometer 21 / Cent.; 
Time of 
observa- 
tion. 
Gauge. 
3 
6 
9 
12 
15 
16 
18 
21 
23 
25 
28 
30 
32 
34 
36 
38 
39 1 
39-2 J 
39-1 1 
!>S9-19 
39*2 J 
39-2 1 
39-1 I 39.18 
39-34 
Total pres- 
sure in lbs. 
per square 
inch. 
Cubic inches 
of air issuing 
per minute 
at atmo- 
spheric 
pressure. 
Temperature of bath by 
Thermometer No. 1, in 
degrees Centigrade. 
Temperature of the issuing air 
by Thermometer No. 2, in 
degrees Centigrade. 
Cooling 
effect. 
357-71 
337-351 
34-410 
11784 
i>357-92= 14-506 
>337-89 = 14 183 
OOO j 
0-323 
358-2 J 
338-4 J 
358-71 
338-8 1 
34-418 
11784 
>358-97 = 14-552 
359*1 1 
339 ^ 338-85 = 14-230 
0-322 
359-2 J 
338-9 J 
359-4^ 
339-25^ 
34-426 
11784 
Hal >359-72=14-584 
Hat >339-69=14-270 
339 -/ 1 
0-314 
360 J 
340 J 
360-i1 
340 1 
34-279 
11784 
! 1360-27 = 14-607 
360-4 j 
U40-25= 14-296 
340-4 j 
0-311 
360-4 J 
340-4 J 
* The use of quicklime as a desiccating agent was suggested to us by Mr. Thomas Ra^ome. 
its purpose admirably after it had fallen a little by use, so as to be finely subAaided. The periecuo - 
action was shown by the desiccating cylinder remaining, after having been used two honrs, cold a 
pTwMe te npper part for abonf 9 inches was made very hot. The analysis of the air passed du^g A 
Ld series of experiments showed that one of the Liebig tubes had gained no weight whatever; 
instance we have observed that the sulphuric acid of 1-8 specific gravity actually lost weight, apparently 
eating that the air dried by quicklime was able to remove water from acid of that density. 
