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Reports on Special Researches 



NO. 18-POLA OBSERVATORY, AUSTRIA. 



For the comparisons at the Pola Observatory, the C. I. W. observations by Mr. J. C. 

 Pearson were all made on the main pier in the absolute room used for the Observatory 

 instruments. Eye readings of the variation instiniments were made simultaneously by the 

 Observatory for declination and horizontal intensity; for inchnation, observations were 

 made with the Observatory earth inductor in the iniddle of each set of observations by 

 Mr. Pearson with Dover dip circle No. 177 (needles 1, 2, 5, and 6). For the D and H 

 observations, Mr. Pearson used C. I. W. magnetometer No. 5. The Observatory standards 

 are: Bamberg magnetometer No. 7904 and a Wild earth inductor. 



Table 18 A. Results of Declination Comparisons at the Pola Observatory, 1910. 



Table ISB. Results of Horizontal-Intensity Comparisons at the Pola Observatory, 1910. 



Table 18 C. Results of Inclination Comparisons at the Pola Observatory, 1910. 



