74 



Ocean Magnetic Observations, 1905-16 



Table 20. — Intensity Constants for Sea Dip-Circle 169 during Cruise III. 

 [After instrument was modified.] 



'Needle 8 was loaded with weight 31. 



^See Table 15, page 69, for the formulte adopted from least-square adjustments. 



'The mean observed values of (log C^£)— log C^/j) from the data for all the stations were -0.00084 and —0.00096 

 for the short and long distances respectively. 



^Deflection observations failed for the short distance at this station. San Lorenzo Island, near Callao. 



Fig. 3. — Curves showing Time-Changes in Values of Intensity Constants for Sea Dip-Circle 169 during Cruise III. 



