26 



ATMOSPHERIC ACTINOMETRY 

 HELSINGFORS. EXPERIMENTS MADE IN 1888. 



On the (lay.s marked witli a ci'oss (x), the sky was more or le.ss overcast at 

 Ilelsingfors. All the figures in the second column ought to be raised slightly, iu 

 oi-der to make them fit to be com[)ared with those in the preceding table, which 

 correspond to an additional hour of exi)osure. Tt will be seen, however, that they 

 are on an average higher, although none of them reach the exceptional figure of the 

 12th of June at Paris. 



The conclusion is the same as that derived from the experiments of 1887. In 

 order to add to its weight we recommenced another series in August and Septem- 

 ber. This time I installed myself on the INIont Dore, at a height of about 1100 

 metres, in a house some distance from that little village. 



MONT DORE, 1 888. 



Remarks. 



Cirrus in the morning, which increased towards evening. 



Fine day. 



" Sky slightly covered. 



t( It ti 



Cumulo-cirrus in the morning. Fine afternoon. 



Fine day. Sky a little cloudy in the evening. South wind. 



Very fine day. .Atmosphere limpid. Cirrus in the evening. 



Rain all day. No exjjosure. 



Sky overcast, and rain. 



Fine day. Cumulo-cirrus and cirrus. 



Cirrus all day, especially in the evening. Barometer nui fulling. 



Large white cumuli. 



