Observations of Deflection, 2nd of October 1876. 



Station Christiania; Lat. 59" 54' 43", Long. 10° 43' 37". 



Mean Time at Station; commencmg 0* 36"" p. m.. ending 1* 20™ p. m. 



Magnet (A) deflecting; (B) suspended. 



Deflecting Magnet 



Distauce j X. End. Temp. 



Readings 

 of Venners 



Mean Corrected Means 



of Verniers Circle Reading and Differences 



East 



i Foot E. 



W. 



E. 



1-3 » W- 



53-°4 143" 17' 4o" 143° 17' 30" 143" 17' 30" 143° 13' 40 



53- 4 



17 20 



90 2 1 o go 21 10 

 2 1 20 



143 9 50 



90 21 10 



90 23 40 



52 50 o Diff. 



53. 3 128 13 20 

 13 20 



13 20 



26 10 26 25 o u 



West 



1 Foot ' W. 



i-3 •• 



i-3 



E. 



AV. 



53. 2 105 7 40 105 7 50 

 8 o 



90" 26' o" i 90 26' 10' 

 26 20 



53- 4 



143 9 40 i 143 9 50 

 10 o 



13' 20" 128 17' 45' 

 22 10 ,105 10 25 



2T, 7 20 Diff. 



105 7 50 



53- o 105 13 o j 105 13 o 

 13 o 



13 o 11 33 4° «o 



E- { 53- o 



128 22 O 128 22 IO 

 22 20 



53° 26 



Mean 



L - 



52. ° 5 



m„ 

 X, 



= 4 r sin u a ; 



Observed Angles of Deflection (u l 



m ' "'■■ * 1 -'■" 1 ft A \ 



x=xj '+;r. + *«.-f>|; 



. r„ = 1.0 = 26 25' o' 



.) 

 f,= 1.3 = 11 33 40 



m _ hi 

 X~X' 



1 — 



r = 1 .0 r — 1 . 



211 

 1- ',= 1.00039 1-00086 Sin. ?<„ Log. 



r = 1.3 

 I r 3 Log. = 9.69888 i 0.04070 

 = 9.64826 9.30193 



-f- (t„ —t)q— 0.00244 



O.OO244 



1 + /' (*<> — f )'I- 1-00283 I 00330 



m, 

 X 



°- Log. = 9.34714 9.34263 



Lou'. 



= 0.00123 



m 

 X' 



0.00143 



Log. - 9-34837 Q-344o6 



1 



= 0.97618 Log. = 9.98953 9.99384 



Observer Carl Wille. 



