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Special Reports 



simultaneous as the condition under which the work was done would permit, 

 test shows no reason to suspect a station-difference. 



Table 2A. Results of Declination Comparisons at the Cheltenham Observatory, 1915. 



The 



1 Station-differences are negligible. 

 Table 2B. Results of Horizontal-Intensity Comparisons at the Cheltenham Observatory, 1915. 



1 Station-diff ei ence is negligible. 



1 Values as observed by C. & G. S. magnetometer 26 are reduced to mean times of obser- 

 vation with C. I. W. No. 26, corrections being determined from magnetogram scaling*. 



Series II, 1917. 

 During January 2 to 5, 1917, inclination comparisons were obtained at the Chel- 

 tenham Observatory of the U. S. Coast and Geodetic Survey by Mr. G. Hartnell, 

 Observer-in-Charge of the Observatory, and Mr. H. R. Schmitt of the Carnegie Insti- 

 tution of Washington. The observations with the Observatory instrument were made 

 on pier A, used regularly for absolute determinations of inclination, in the east wing of 

 the absolute house. The extra pier, B i} in the west wing of the absolute house was 



