Observations among the Alps. 309 



Summit of Mont Blanc, July 14, 1866, Actinometer (K). 



A. 



B. 



c. 



D. 



E. 



F. 



! s. 



H. 



i. 



K. 



L. 



I Appa- 

 rent time 

 J of com- 

 mencing 

 cachobs. 



Sun 



o, 



shade 

 x . 



Initial 

 reading. 



Ter- 

 minal 

 reading. 



Change 



in sun, 



+ . 



Change 

 Jn shade 



Solar 

 i effect 

 ']' unre- 

 duced. 



i Tempe- 

 rature o: 

 ! liquid. 



1 



1 Solar 

 effect re- 

 duced to 

 32° F. 



Actino- 

 meter 

 i (KJ re- 

 1 duced 

 to CA). 



Ave- 

 rages. 



! h m 















1 









8 28* 



X 



1732 



1192 





540 





o 









8 30 







1172 



1300 



128 





716 



51 



708 



913 





, 8 314 



X 



1238 



602 





.636 













8 33" 







600 



714 



114 





738 



50 



730 



942 





8 344 



X 



662 



50 





612 













9 61 



X 



2098 



1792 





306 













; 9 S" 



o 



1890 



2272 



382 





718 



50 



711 



917 





9 H 



X 



2200 



1834 





366 













9 11 







1840 



2234 



394 





772 



50 



764 



986 



955 



9 \2h 



X 



2200 



1810 





390 













9 14" 







1882 



2270 



388 





753 



50 



745 



961 





9 15| 



X 



2120 



1780 





340 













! 9 19* 



X 



1460 



1198 





262 













9 21" 







1300 



1800 



500 





788 



48 



781 



1007 





9 22f 



X 



1852 



1538 





314 













9 24 







1582 



2032 



450 





775 



48 



768 



991 



995 



9 25$ 



X 



2026 



1690 





326 













9 27 







1754 



2178 



424 





772 



49 



764 



985 



994 



9 29i 



X 



1760 1400 





360 













9 31 







1472 I 1898 



426 





789 



49 



781 



1007 



993 



9 82i 



X 



1908 1540 





366 













9 33" 







1568 ! 1974 



406 





765 



49 



757 



977 



996 



! 9 354 



X 



1972 1620 





352 













9 36 







1692 



2150 



458 





787 



49 



779 



1003 



998 



! 9 384 



X 



2146 



1840 





306 













9 39" 







1880 



2358 



478 





789 



49 



781 



1007 



1002 



9 4H 



X 



2290 1974 





316 













9 43" 







2068 2514 



446 





781 



50 



773 



996 





9 44| 



X 



2454 



2100 



! 



354 













9 oil 



X 



1908 



1580 





328 













9 53 







1558 



1980 



422 





760 



50 



752 



970 





9 514 



X 



1894 



1546 





348 













9 58" 







1608 



2042 



434 





788 



50 



780 



1006 



992 



9 574 



X 



2022 



1662 





360 













9 59" 







1680 



2094 



414 





783 



50 



775 



1000 



988 



10 0| 



X 



2062 



1684 





378 













10 2 







1788 



2164 



376 





758 



51 



750 



967 



993 



10 34, 



X 



2126 1 1740 





386 













10 5" 







1820 | 2220 



400 





783 



51 



774 



999 



994 



10 64 



X 



2190 ; 1810 





380 













10 8" 







1904 ' 2290 



386 





776 



51 



768 



991 



1001 



10 9.| 



X 



2426 2026 





400 













10 11 







2060 



2440 



380 





795 



52 



786 



1014 





10 12§ 



X 



2380 



1950 





430 













10 19^ 





1270 



992 





278 













10 21 





1086 



1580 



494 





792 



52 



783 



1010 





10 22| 





1600 



1282 





318 













10 24 





1386 



1828 



442 





778 



52 



769 



992 ! 





10 254 





1764 



1410 





354 









1 





There corded numbers denote tenths of the scale which is divided to 

 millimetres, the last figure being assigned by estimation. 



