76 AKSEL S. STEEN. TERRESTRIAL MAGNETISM. [NORW. POL. EXP. 
le 
e E 
1397S rApmUdS te ee LOMA: 0:076523 
eign i Te Ottis. O076a8s 
Mean 011760  0°076454 
According to the table given on page 69, the 
mean found in Hamburg in 1893, is . . 0711799 0:076800 
Mean 011780 0:076627 
As regards the values of « for magnet VZ, I will refer the reader to 
what is said on this subject on page 70, merely adding that this magnet 
was not used for deflections with the double needle as deflected magnet 
before September 30th, 1893, and therefore the values of mw found for 
this mounting of the apparatus in Wilhelmshaven in 1897, have been exclu- 
sively used. 
It was not possible to check the constant C during the expedition, 
a knowledge of the horizontal intensity determined by the aid of another 
instrument being required for such a check. I have therefore taken the 
mean of the values found in Hamburg in 1893 and in Wilhelmshaven in 
1897, in the cases in which the small declination-needle has been used as 
deflected magnet, while we have only the determinations in Wilhelmshaven 
in 1897, in the cases in which the double needle has been used as deflected 
magnet. 
The following table gives a summary of the final values of the constants 
w and C, used in every case for the reduction of the observations: 
Period 
e E e E 
1893— 1896 0:11780 | 0:076627} 0:27199 | 0:17693 
1893— 1896 011619 | 0°076052} 026805 | 0:17536 
before Sept. 30, 1893 0°14634 | 0:095284] 0°34041 | 0:22148 
after Sept. 30, 1893 0°14294 | 0:092220] 0°34041 | 022148 
before Sept. 30, 1893 
after Sept. 30, 1893 | 0:14056 | 0:091919] 0°33571 | 0:21960 
When the expressions for direct employment in the formule, log Cu and 
log a, are calculated by the values in the above table, it will be found that 
