RADIATION IN ABSOLUTE MEASURE. 
607 
Table IT. (continued).—Copper globe very finely sooted. 
October 25, 1889. Air. 
Pressure 76 centims. 
Temperature of bath surrounding enclosure, 
17“ C. 
October 29, 1889. Vacuum, 
Pressure M. 
Temperature of bath surrounding enclosure. 
15°-3 C. 
Excess of tempei’ature 
Loss of beat per sq. 
Excess of temperatui’e 
Loss of heat per sq. 
of globe above tempei’a- 
centim. per second 
of globe above tempera- 
centim. per second 
ture of surroundings. 
per 1° C. of excess. 
ture of suri oundings. 
per 1° C. of excess. 
O 
76T 
2-80 X 10-^ 
■ 83-6 
1-25 X 10-^ 
68-25 
2-73 
78-2 
1-23 
59-1 
2-65 
733 
1-21 
51-6 
2-57 
68-7 
1-19 
45-1 
2-50 
64-6 
1-17 
39-75 
2-42 
60-7 
1-15 
.34-8 
2-34 
57-1 
1-14 
30-7 
2-26 
53-9 
1-12 
27-2 
2-19 
50.-7 
1-10 
24-2 
2-11 
47-8 
1-08 
21-6 
2-03 
45-13 
1-06 
19-6 
1-95 
42-7 
1-05 
18-1 
1-88 
40-4 
1-03 
36-3 
0-99 
32-7 
0-95 
It will be of interest, in order to observe tlie way in whicli the cooling proceeds, to 
remark that the excess temperatures set down in the temperature columns are 
practically those observed at the ends of successive intervals of five minutes. 
