TERRESTRIAL MAGNETIC INTENSITY. 



TABLE I. (continued.) 



31 



63. In the two following tables are contained the observations with the six- 

 inch dipping needle above described. I have been careful to give the separate 

 results with the needles magnetized in either direction, because they afford 

 some estimate of the confidence due to the observations. Some of these varying 

 differences do not appear to be errors of observation, but rather due to an acci- 

 dental displacement of the centre of gravity, or to the inequality of magnetization 

 with reversed poles. 



TABLE II. 



