NO. 8.] 



PENDULUM OBSERVATIONS. 



19 



Christiania. The Pendulum-house (in the garden of the Observatory). 



Distance I = 1930 mm., thermometer 20, barometer, an aneroid, Gary 623, of which 

 the correction was daily determined by the aid of a hypsometer, Tonnelot 11364, with 

 divisions of fiftieths of a degree. 



May 30th, 1897. 

 Comparison of Clocks. 



Pendulum Michelet 

 h m s h m s 

 3 47 52 11 35 395 



50 57 38 44 



3 49 24-5 11 37 11 '75 



log 1* Michelet = 56.10- 1 ? 



Hawelk 

 h m s 

 5 30 55 

 32 40 



Michelet 

 h m s 

 7 57 49-5 

 59 35 



Error of Pendulum 8 

 May 30, Midnight 44-75 

 31, 44-78 



Hawelk 

 h m s 

 6 28 58-5 

 3040-5 



Michelet 

 h m s 

 8 56 9-5 

 57 52 



5 31 47-5 7 58 42'25 



6 29 49-5 8 57 0'75 



log 1* Hawelk = 0-0020482 log 1 Hawelk = 0020475 



