362 C. C. Hutchins — Radiation of Atmospheric Air, 



a 

 Nov. 23 



Not. 26 



Dec. 4 



Dec. 6 



Dec. 7 



Dec. 8 



76-3 



i6-0 



f5'5 



75-3 



76-6 



7-89 



6'50 



4-76 



6-16 



5-08 



Table 



II. 







c 



t-f 



9 



h 



4-741067 



53-7 



18-42 



0-000001889- 





77-6 



29-9 



2123 





89-3 



36-4 



2246 





119.0 



59.7 



2763 





167-5 



93.8 



3085 



4-714927 



53-0 



14-2 



0-000001390 





80-0 



27-0 



1751 





86-0 



29-2 



1761 





96-5 



355 



1908 





138-0 



64-0 



2453 





167.0 



92-5 



1908- 



3-014392 



53-0 



10-37 



0-000002022 





67-5 



14-9 



2282 





1000 



24-3 



2511 





145-0 



39-9 



2845 





188-0 



62-5 



3437 



4-440807 



64.3 



32-8 



0000001407 





83-5 



40-4 



1305 



3-166587 



840 



9-0 



1572 



4-440807 



115-0 



575 



1380 





152-0 



87-0 



1574 



3-1665S7 



185-0 



21-6 



1713 



4339524 



47-0 



28.3 



0-000001393 





875 



58-6 



1464 





113-0 



74-2 



1435 





153-5 



103-5 



1473 





•205-0 



147-6 



1573 



4-393008 



46-0 



20-5 



0-000001102 





82-0 



43-0 



1299 





104-0 



51-9 



1234 





160-0 



1065 



1637 



a is the date. 



b " barometer reading-. 



/ " absolute humidity. 



c " log reduction factor. 



i-f " difference in temperature between air and cube. 



g •■ mean galvanometer deflection. 



h " absolute radiation of air. — The amount of heat lost each second from 

 each square centimeter of surface for each degree of difference between the tem- 

 perature of the air and of the surroundings, the sheet of air being one centimeter 

 thick. 



Upon plotting- each day's observations separately using the 

 value t-t' as ordinates, and the corresponding values of h as 

 abscissas we find that in every case the observations are repre- 

 sented by a straight line. Whence we deduce that in the case 

 of air within the limits of temperature here employed the 

 increase of radiation is proportional to the increase of tempera- 

 ture. This relation will doubtless be found true of other 

 gases, and to apply to a wider range of temperatures. The 

 mean equation of the six sets of observations given in the table 

 is, 



h = 0-000001133 + 0-00000000711^— O 



