87 
s 
Solar radiation plus sky radiation erpressed as actinometric percentages accord- 
ing to Marié-Davy, caleulated for skies as clear as at Montsouris and for 
various latitudes. 
Date. 
Noon observation, Mean of 5observations 
RIA Iy gle ae aes eae mes See et ek Seek 
semiieitavalleeee een een se co 4. ok eee ee oe 
* Lien OA Lk Sas ter ee ee ie eee een, alee age 
Goreaidy bas Sa cee SS ee ee ee eee eee 
Heleustsyuliten = totsetcee a 5 fess oP op ene 
ISO IEUaT Vas ete een Ae hegen  e steerer a she 
UE TRH AY TL 6 eae Pape re ae Sin, ig Gti ee a 
Wie yrireh al FUL le sO eT al See Roe 
WR FAL Seo See ae 2 Seen eae Ee nee ee oe ee 
O CTO DET leer eae i bey Been ro ee 
INOVemiberwlewa teers yok Oh Oe ee Caos Bk yas 
November 11 
IIOW Gr OGRA ee Se ee ee ees eee eee 
IDeaaisay ere al Sacer ee A Ries = eee es eee Se 
December 11 
WMecemborie ieee eas a5. set 
UAV lene eon eee aaa eee i ed 
34.6 
THEORETICAL FORMULA FOR ACTINOMETER. 
latitude— daily, latitude— 
| 42° N.| 46°N.| 50° N.| 42° N.| 46° N. | 50° N. 
73.6 | 69.9] 65.1 | 38.0) 34.6 30.2 
74.5| 71.2| 66.7| 39.0] 35.9 31.9 
75.9| 72.9] 69.0] 40.3] 37.7 34.2 
OS NN) Be |e Si N 42; 08). 89,9 37.0 
79.1| 77.0 | 74.4| 43.5| 41.8 39.6 
80.6] 78.9) 76.7) 45.0] 436] 41.9 
81.6] 80.1] 784] 46.2] 44.9 43°7 
82.8| 81.6} 80.1] 49.6] 48.6 47.5 
88.8| 82.8] 81.6) 55.7| 55.0] 542 
84.7| 83.8] 82.9| 60.7] 60.6| 60.2 
85.3} 84.6| 83.8] 65.0] 65.1 65.1 
85.8] 85.2| 846] 68.4.) 68.7 68.9 
96.2) 85.71}: 85.0] 71.0] 71.5 71.8 
86.5 | 86.0] 85.5) 73.0] 73.4 73.8 
86.7| 86.3| 85.8] 74.3] 74.9 75.3 
86.8] 86.5] 86.0} 75.3) 75.9 76.3 
86.9] 86.5] 86.2] 75.9) 76.3 76.8 
87.0| 86.6) 86.2) 76.0) 76.6 77.0 
86.9| 86.5) 862] %5.8| 76.3 76.8 
86.8| 86.5] 86.0| 75.3 | 75.9) 76.3 
86.7) 86.3) 85.8) 74.4) 75.0 75.4 
86.5) 86.0) 85.5 13.0) 73.5 73.8 
86:2 | 85.7] 85.11 71.0] 71.5 71.9 
85.8 | 85.2| 84.5, 68.4) 68.8 69.0 
8.31 84.5] 83.7| 64.7] 64.8 64.8 
84.6| 83.8| 82.8| 60.5] 60.2) . 59.9 
83.8) 82.8| 81.6} 55.9] 55.3 54.5 
82.9] 81.7) 80.2) 49.4] 48.5 47.5 
81.7| 80.3| 78.5) 46.1] 45.0 43.6 
80.4 | 78.7] 76.4) 44.8) 43.4 41.6 
78.8| 76.6] 73.9| 483] 41:5 39.1 
7.2) TA) Ts 41.3) 39.0 36.0 
Hoste 72-7, |te, 68.8.) en 40: 2, | corals 34.0 
74.4| 71.0) 66.5| 38.8| 35.7%7| 931.7 
73.5 | 69.8) 65.0] 87.9| $4.5] 930.1 
73.2) 69:4] 644) 97.6/ 341 29.5 
73.6) 69.9] 65.1| 38.0 30.2 
In reply to some criticisms of Violle, Marié-Davy (1880, p. 245) 
gives the only statement that I have seen of his theory or explanation 
It is about as fol- 
of the working of his conjugate thermometers. 
lows: Let— 
a be the absorbing power of the bright bulb. 
/ the absorbing power of the black bulb. 
ca numerical coefficient for converting degrees of temperature into 
a quantity of heat. 
