NO. 13 



THE MELIKERON ALDRICH 



II 



They fit the observations much closer than the mean. This would 

 be expected. To increase either the humidity or the temperature is to 

 diminish the proportion of the extreme long-wave rays. The insertion 

 of the salt plate in the above reported experiments with Melikeron 

 No. I had a similar tendency. Hence, in view of the earlier observa- 



Table III 



Date, 1920 



Mt. Wilson 



August 25 



August 27 



August 28 



August 28 



August 28 



Mt. Harqua Hala 



September 29. . 

 September 30. . 



October i , 



October 2 



October 3 



Wet and dry (O 

 readings, F. 



Wet 



r45.o 



I45.7 

 fSO.I 



52.0 



r48.3 

 I46.0 



r45-5 

 I45.0 



53-0 

 53.0 



47.6 

 48.7 

 50.0 

 50.0 

 45-9 

 45.9 

 49-5 

 49.2 



{ 



Dry 



48.6 

 48.4 

 58.3 



57-3 



S8.2 

 58.0 

 58.0 

 58.2 

 57-3 



70.5 

 70.2 

 69.0 

 67.0 

 64-3 

 64.3 

 63.5 

 62.3 

 66.0 

 65.5 



Pressure 

 aqueous 

 vapor (p) 



7.1) 



7-3J 

 '.3\ 

 '.2j 



?■ 



8.5 



6.4I 



5-iJ 

 4. 



4' 





6.21 



6.3J 



3. 



4. 



5-9 



5-9. 



3. 



4. 



5. 



;} 



Constant of 

 pyrgeometer 



No. 23 



9.36 

 10.00 



9.29 



9.78 



10.33 



9.40 

 9.70 



36 



02 



95 



A from 

 mean 



0.36 

 +0.28 



3.43 

 +0.06 



+0.61 



0.32 

 — 0.02 

 —0.36 

 +0.30 

 +0.23 



Com- 

 puted 

 value 



9-59 



9-43 

 9.03 

 9.90 



10.19 



—0.23 



+0.57 

 +0.26 

 — O. 12 



+0.14 



9.23+0.17 

 9.99 — 0.29 

 9.42 — 0.06 

 10.06 — 0.04 

 9.65+0.30 



tions, from the analogy, we should expect by increasing humidity or 

 temperature to reduce the observed pyrgeometer constant. The 

 observations are in harmony with this view. 



It is hoped many further experiments with the melikeron may soon 

 be made with a view to a better knowledge of the behavior of long 

 wave-length radiation in our atmosphere and as emitted by bodies at 

 low temperatures. 



