Comparison of Formulas for Total Radiation. 441 



very nearly a straight line parallel to the axis of abscissas. It 

 will be most convenient to arrange such a series therefore in 

 the order of increasing temperature-differences, which is the 

 reverse of that in the tables just given. Any irregularities in 

 the curve must be due to the errors of experiment, and partly 

 to the fact that logarithmic results are only approximations. 

 Table Y is made up of the deviation columns from five inde- 

 pendent series of observations ranging through 40°, to which 

 Weber's formula has been applied. Table YI contains the 

 application of Stefan's formula to the same series. 



Table YII shows Weber's formula, and Table YIII Stefan's 

 formula, applied to six independent series of observations 

 ranging through 80°. In each case the mean of each vertical 

 column is shown. 



Table V.— Weber. 



T-T„ 



5 



10 



15 



20 



25 



30 



35 



40 



45 



I 



0-983 



0-989 



1005 



1-007 



1-007 



0-997 



1-001 



1-007 



1007 



II 



1-O08 



0-998 



1-013 



1-004 



1-000 



0-993 



0-992 



0993 



0-999 



III 



1-006 



1-002 



0-998 



1-003 



0-998 



1001 



0-995 



0-997 



0-999 



IV 







1001 



1-006 



1-006 



1 006 



0-994 



0993 



1-002 



0-994 



V 



---- 



1-002 

 0998 



1-009 

 1006 



1-011 

 1-006 



0-996 



1-002 



0-996 

 0996 



0-996 



996 

 0999 



0-997 



Mean 



0-999 



0-995 



0999 









Table VI. 



— Stefan 











T-T„ 



5 



10 



15 



20' 



25 



30 



35 



40 



45 



I 



0-906 



0-971 



0-991 



0-998 



1-008 



1-012 



1-027 



1-040 



1-046 



II 



0-928 



0-980 



0998 



0995 



1-000 



1-008 



T017 



1-025 



1-045 



III 



0-928 



0-987 



0-988 



0-995 



0999 



1-016 



1-021 



1-007 



1-039 



IV 





0-973 



983 



989 



0-997 



1-000 



1009 



1-043 



1-024 



V 



---- 



977 



0-986 



0993 



0-988 



1-002 



1-012 



1-020 



1-026 



Mean 



0-921 0-978 0-989 0-994 998 1-008 1 017 1'023 1-036 



Table VII.— Weber. 



T-To 



15 



25 



35 



45 



55 



65 



75 



85 



95 



I 



0-993 



0977 



0-997 



1-001 



1-014 



1024 



0992 



1-006 



0996 



II 



1-004 



1006 



1-005 



1-004 



1003 



0-999 



0-996 



0988 



0-996 



III 



1-014 



1-009 



1-003 



1-002 



0-999 



0-993 



0-990 



0993 



0995 



IV 



0-997 



1-011 



1-002 



1-002 



0997 



0990 



1-014 



1-001 



1017 



V 



0-999 



1-001 



1-004 



1-003 



1-002 



1-001 



0995 



0991 



0-996 



VI 



1;001 



1001 



1-000 

 1-001 



1-001 



1-001 

 1-002 



1-001 

 1-001 



0-999 

 0-998 



0-998 

 0996 



- — 



Mean 



1:002 



1000 









Table VIII 



— Stefan. 









T-To 



15 



25 



35 



45 



55 



65 



75 



S5 



95 



I 



0-925 



0922 



0965 



0-979 



1-014 



1044 



1-027 



1059 



1 064 



II 



0937 



0-949 



0-973 



0-983 



I 005 



1-019 



1-032 



1-041 



1063 



III 



0-945 



0-953 



0971 



0981 



1-000 



1-014 



1-026 



1-047 



1-064 



IV 



0-926 



0-951 



0-966 



0-977 



0-995 



1-006 



1 046 



1051 



1-083 



V 



0931 



0-950 



972 



0-982 



1-003 



1-021 



1-030 



1-042 



1-065 



VI 



---- 



---- 



0957 



0-970 



993 



1-024 



1-024 



1-042 



.... 



Mean 0-933 0-945 0-968 0-979 1-002 1-019 1-031 1-047 T068 



