AT TWENTY-ONE STATIONS IN EUROPE. 



95 



M. QuETELET assigns 1.112 as the horizontal intensity at Turin, and MM. 

 Humboldt and Gay Lussac give 0.9911 as the total intensity. The latter 

 number exceeds my determination very considerably. 



LYONS. 



These observations were made in a meadow to the south-east of Lyons, and 

 across the Rhone from the city. In reducing the time of ten oscillations for 

 the rate of the chronometer, the mean of the rates at Turin and Paris, which 

 differed very slightly, has been employed. 



Ohservatimis at Lyons. 



For Horizontal Intensity. 



Place. 



Needle. 



Date. 



Temp. 



m 



O 



d 



CO 

 CO 







Time of 



Ten 



OsciU'ns 



at 60°. 



Sees. 



Coeffic't 



of 

 Corr'n 



for 



Loss of 



Magn'm. 



Horizontal 

 Intensity. 



Tear. 



Month. 



D. 



H. 



Fah. ° 



Paris 1. 



Lyons 



Cylinder 

 Bar 



1838 



June 



25 



121, P.M. 



75.7 

 74.1 



2 

 2 



700 

 750 



33.739 

 36.391 



.9991 

 .9995 



Mean, 



1.077 

 1.079 



1.078 



For Dip. 





Lyons, 1838, June 24, Needle No. 1, 64° 49'. 5. 



No. 2, 48 .6. 



Mean, 64° 49'.0. 







Total Intensity at Lyons, compared with Paris as 



unity, 0.978. 





According to MM. Humboldt and Gay Lussac, the total intensity at Ly- 

 ons is .9889. 



CHAMOUNI AND THE FLEGIERE. 



The place of observation which appeared to me most suitable^ at the time of 

 my visit to Chamouni, was in a field in rear of, and at some distance from, the 

 Union Hotel. On the Flegiere the observations were made not far from, and 

 about thirty feet above, the point where the cross is placed. The height of 

 this point above the Valley of Chamouni is, in round numbers, about 3500 feet, 

 and the valley itself is 3400 feet above the level of the sea. 



