87 



Solar radititiun plus shi/ radiutioii c.iprrsscd iis iictiiinnirlric ixrcciitot/cs dccord- 

 iii)/ to Marir-lhtrii. calculated for sJclcs as clear as at M(iiil:<(iuris and for 

 various latitudes. 



January 1 . . . 

 January 11 . . 

 January 21 . . 

 February I.. 

 February 11. 

 February 21. 



Mareh 1 



Mar. h 11 .... 



March 21 



April 1 - 



April 11 



April 21 



Mayl 



May 11 



May 21 



June 1 



June 11 



June 21 



Julyl 



July 11.. 



July21 



August 1 



August 11 



August 21 



September ] . 

 September 1 i 

 September 21 



October 1 



October 11 



October 21-... 

 November 1.. 

 November 11. 

 November 21. 

 December 1 . . 

 December 11 . 

 December 21 . 

 Januarj' 1 



Noon observation, 

 latitude— 



jMeau of 5 observations 

 I daily, latitude— 



42° N. 46° N. ! 50°N. 42° N. 



69.9 

 71.2 

 72.9 



75.1 

 77.0 

 78.9 

 80.1 



84.6 

 85.2 



86.5 

 86.5 

 86.3 

 86.0 



84.5 

 83.8 

 82.8 

 81.7 

 80.3 

 78.7 

 76.6 

 74.7 

 72.7 

 71.0 

 69.8 

 69.4 

 09.9 



65.1 

 66.7 

 69.0 

 71.8 

 74.4 

 76.7 

 78.4 

 80.1 

 81.6 

 82.9 

 83.8 

 84.6 

 85.0 

 85.5 

 85.8 

 86.0 

 86.2 

 86.2 

 86.2 



85.8 

 85.5 

 85.1 

 84.5 

 8:3.7 

 82.8 

 81.6 

 80.2 

 78.5 

 76.4 

 73.9 

 71.4 

 68.8 

 66.5 

 65.0 

 64.4 

 05. 1 



38.0 

 39.0 

 40.3 

 42.0 

 43.5 

 45.0 

 46.2 

 49.6 

 55.7 

 60.7 

 65.0 

 68.4 

 71.0 

 73.0 

 74.3 

 75.3 

 75.9 

 76.0 

 75.8 

 75.3 

 74.4 

 73.0 

 71.0 

 68.4 

 64.7 

 60.5 

 55.9 

 49.4 

 46.1 

 44.8 

 43.3 

 41.3 

 40.2 

 38.8 

 37.9 

 37.6 

 38. 



37.7 

 39.9 

 41.8 

 4:3.6 

 44.9 

 48.6 

 55.0 

 60.6 

 65.1 

 68.7 

 71.5 

 7:14 

 74.9 

 75.9 

 76.3 

 76.6 

 76.3 

 75.9 

 75.0 

 73.5 

 71.5 

 68.8 

 64.8 

 60.2 

 55.3 

 48.5 

 45.0 

 43.4 

 41.5 

 39.0 

 :37.5 

 .35.7 

 :34.5 



:34.l 



:34.6 



31.9 

 :!4.2 

 37.0 



41.9 

 4:5.7 

 47.5 

 54.2 

 60.2 



a-).i 



Oh. 9 

 71.. s 

 7:1 8 

 75.3 

 76.3 

 76.8 

 77.0 

 76.8 

 76.3 

 75.4 

 73.8 

 71.9 

 69.0 

 64.8 

 59. 9 

 .54.5 

 47.5 

 4:3.6 

 41.6 

 :i9. 1 

 ;36.0 

 :34.l) 

 31.7 



;«).i 

 ;M.5 



THEORETICAL FORMXTLiE FOR ACTINOMETER. 



In reply to some criticisms of Violle, Marie-Davy (1880, p. 245) 

 gives the only statement that I have seen of his theory or explanation, 

 of the working of his conjugate thermometers. It is about as fol- 

 lows: Let — 



a be the absorbing power of the bright bulb. 



/ the absorbing power of the black bulb. 



r a numerical coefficient for converting degrees of temperature into 

 a quantity of heat. 



