xlvi INTRODUCTION. 
TABLE 21.—Observations for Magnetic Dip in different Azimuths. 
B Dipping. A. Dipping. 
Limb E. Limb W. Limb E. Limb W. 
Azimuth. 
Face of Needle Face of Needle Face of Needle Face of Needle 
Azimuths. n ne 
30 and 120 73 30-69 80 25-62 
60 --- 150 80 27-69 73 23-19 
0 
0 and 90 71 21-12 89 46-50 
15 --- 105 71 47-19 85 0-75 
30 --- 120 73 18-56 80 27-94 
45 --. 135 76 27-12 76 20-12 
60 --. 150 80 25-25 73 20-75 
75 +» 165 84 56-87 71 47-87 
In the first series, giving the observation at Azimuth 0° a value 
6 =71° 12'.9; Correction for Needle No.1 = — 89 
in the second series, 
@=71° 9.3; Correction for Needle No.1 = — 118 
In the Abstracts of Magnetic Dip the observations haye been corrected by — 12’. 
