22 GAUSS AXD WEBER ON TERRESTRIAL MAGNETISM. 



ment, were made at the appointed terms, in the years 1829 and 

 1830, in BerHn, Freiberg, St. Petersburg, Kasan, and Nicohijef, 

 together with the graphical representations of three of them. 



In the Gbttingen magnetic observatory, which was built in 

 the year 1833, and in which the magnetic apparatus is entirely 

 different in construction from any previously employed, these 

 term-observations were made for the first time on the 20th and 

 21st of March, 1834; corresponding observations were made 

 in Berhn ; but at Gottingen the observations were made every 

 ten minutes, and in Berlin only eveiy hour. Those at Berlin 

 exhibited several considerable movements, which were found 

 also in the Gottingen observations ; while these latter exhibited 

 in the interv'ening times a great number of movements which, 

 of course, were entirely wanting in those made at Berlin. The 

 question, whether the greater part of the fluctuations observed 

 in Gottingen had been merely local, I'emained therefore still un- 

 decided. 



The following term of the 4th and 5th of May, 1834, brought 

 Avith it the decision. The inten-ening periods were more li- 

 mited, the obsenations being made everj" five minutes, which 

 gave to the results a considerably more definite character. 

 No con*esponding observations with Gambey's apparatus du- 

 ring this term, or in any subsequent ones, have been published. 

 On the other hand, M. Sartorius, who had taken an active part 

 in the March term-observations at Gottingen, and who, being 

 on the point of undertaking a journey of several years to Italy, 

 had provided himself with an apparatus similar to the one at 

 Gottingen, but of smaller dimensions, made with it careful and 

 complete observations, at short intervals, during the May- term, 

 at Waltershausen, in Bavaria, about twenty German miles from 

 Gottingen. A concordance surprisingly great was manifested, 

 not only in the larger, but even in almost aU the smaller oscilla- 

 tions, so that in fact nothing remained which could be justly 

 ascribed to local causes. 



During the three following terms, i. e. in June, August, and 

 September, 1834, the observations were continued at Gottingen 

 in exactly the same way ; and the number of observers at other 

 places, with apparatus either the same or of similar construc- 

 tion, was continually on the increase. Professor Encke, having 

 become acquainted, from personal inspection, with the airange- 

 ments in Gottingen, ordered provisionally a similar apparatus of 



