328 Rev. G. C. Hodgkinson's Actinometrical [Jan. 17, 



Comparison of Results, Summit of Mont Blanc and Chamonix. 





M . Blanc. 





Ratio of 





Actinome- 





1 



Ratio of 





Actinome- 



Chamonix. 



actinome- 





ter (K) re- 



Cliamonix 



actinome- 



Apparent 



ter (K) re- 



actino me- 



ters, Mont 



Apparent 



duced to 



actinome- 



ters, Mont 



time. 



duced to 



ter (A). 



Blanc and 



time. 



actinome- 



ter (A). 



Blanc and 





actinome- 



Chamonix. 





ter (A). 



Chamonix., 





ter (A). 













h m 









h. lu 









8 27 





812 





9 34 



996 







8 30 





799 





9 35 





811 





8 33 





794 





9 37 



998 





8 36 





805 





9 38 





809 





8 39 





803 





9 40 



1002 





8 42 





800 





9 41 





822 



1-219 



8 45 





803 





9 44 





835 





8 48 





802 





9 47 





838 





8 51 





791 





9 56 



992 







8 54 





797 





9 59 



988 







8 57 





795 





10 2 



993 







9 





807 





10 5 



994 







9 11 



955 



821 



1-163 



10 8 



1001 







9 14 





807 





10 9 





826 



1-212 



9 17 





800 





10 11 



1014 







9 24 



995 







10 12 





841 



1-206 



9 27 



994 







10 15 





853 



9 31 

 9 32 



993 



798 



1-244 



10 21 

 10 24 

 10 32 



1010 

 992 



814 





Meteorological Observations on summit of Mont Blanc and at Cliamonix, 



July 14, 1866. 







Mont Blanc. 



Chamonix. 



Mean 

 time. 



Apparent 

 time. 



Thermo- 

 barometer. 



Thermo- 

 meter 

 (dry). 



Thermo- 

 meter 

 (wet). 



Barometer 

 corrected 

 and re- 

 duced to 

 32° F. 



Thermo- 

 meter 

 (drjO. 



Thermo- 

 meter 

 (wet). 



h m 

 8 30 



8 40 



9 30 

 9 45 



10 45 



11 

 2 5 



h m 

 8 25 



8 35 



9 25 

 9 40 



10 40 

 10 55 

 2 



16-86 



Boiling- 

 point — 

 184°-5 P . 



22 F. 

 22-5 F. 

 24 F. 



Below 20 

 Below 20 



26-90 



69° F. 

 72 F. 

 75 F. 

 82 F. 



57 F. 

 59 F. 



58 F. 

 63 F. 



Appendix (A). 



Description of the Actinometer. 



The actinometer employed consists of a thermometer with a spherical 

 bulb one inch in diameter, and a tube, of which an inch and a half next the 

 bulb is, for a reason which will presently be apparent, left unsealed. The 

 succeeding ten inches is made to represent, as nearly as may be, the range 



