5S9 



Article XX. 



Results of the Daily Observations of Magnetic Declination 

 during six years at Gottingen. By Dr. B. Goldschmidt. 



[From the Rcsultate aus den Beohachtungen des magnetischen Fereins im 

 Jahre 1 839.] 



In the volume of the Resultate for 1836, M. Gauss com- 

 municated the results of the observations of the magnetic de- 

 clination, made daily in the magnetic observatory at Gottingen, 

 from the l7th March, 1834, to the 31st of March, 1837, and 

 combined them in various ways for the purpose of determining 

 the march of the declination*. Since that period these obser- 

 vations have been continued uninterruptedly by me according 

 to the same plan, and we have now before us the determina- 

 tions of six years, which I propose to consider in this treatise. 



To the mean values of the declination for the several months 

 of the three first years, published as above, we have now to add 

 the following : — 



We will now proceed to combine these numbers in the same 

 manner as was done with the observations of the first three 

 years, beginning with the deduction of the differences between 

 the forenoon and afternoon declinations. These differences, the 



* Translated in the Scientific Memoirs, vol. ii. Part V. pp. 54 to 65. 



