82 GAUSS AND WEBER ON TERRESTRIAL MAGNETISM. 



no - < = 23° 9' 

 Wj _ u/ = 47° 42' 

 71° 48' 



I _ 



«2 — ^2 



uj' - <" =69° 21' 

 M," - m/" = 46° 12' 



?«J' _ <" = 22° 27' 



R^ = 450"! 



i?, = 350 [-millimetres 



i?2 = 30oJ 



^ = 6"-67 



a = lOl-O"! .„. . 

 _ ^ > millimetres. 



j:> = 142000 milligrammes. 



From these may next be calculated, 



Vq=^ i (23° 9' + 22° 27') = 11° 24'-00 

 Vi = i (47° 42' + 46° 12') = 23° 28'-50 

 «;^ = i (71° 48' + 69° 21') = 35° l7'-25 

 If now we take the second and the millimetres as the funda- 

 mental units of time and space in our calculation, we may deduce 

 from the ascertained values of l?o, R^, R^, v^, v^, fg, the following 

 values of A, A', B, B', B", viz. 



^ tang 11° 24' tang 23° 28'-5 tang 35° l7'-25 _ 385-54 

 ^ ~ 450^ "^ 350^ ■•■ 300^ ~ IQi" ' 



tang 11° 24' tang 23° 28'-5 tang 35° l7'-25 _ 384-86 ^ 

 ~ 450^ "'" 350^ "^ 300^ "" 10>'^ ' 



1 1 1 _ 2-0362 



~ 450^ "*" 350^ "•■ 300« ~ 10^^ ' 



n, 1 , 1 I 1 2-0277. 



~ 450^ "^ 350^ ^ 300« ~ lO^^ » 

 _ 1 1 1 _ 2-0855 



~ 45010 + 35010 + 30010 " 10^^ ' 



From these r is calculated : 



_ j^ 385-54 + 2-0855 - 384-86 + 2-0277 ^qS 

 ^~ ^' 2-0362 + 2-0855 - (2-0277)^ 

 or 



r = 87650000. 



