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Reports on Special Researches 



all observations with needle No. 1 for inclinations ranging from 14. 5 to 19, because of 

 the very erratic behavior of the needle in this region of dip. The inclination comparisons 

 are thus dependent upon only one needle (No. 2) for each instrument. Dr. Morize states, 

 under date of June 23, 1913, that he expects to use for the absolute observations a Wild 

 earth inductor; accordingly, as additional comparisons will be obtained in the near future, 

 only the mean result of the 1913 inclination comparisons, referred to I. M. S. (see p. 

 273), is given, namely: I. M. S. Rio de Janeiro dip circle 114 (needle 2) = 4'. 2 (pro- 

 visional result). 



T.iVBLB 21 A. Residls of DtclinaUon Comparisons at the Rio de Janeiro (.Vassouras) Observatory, 1913. 



'AH values are referred to station A; A = B V. 

 Table 21 B. Results of Horizontal-Intensity Comparisons at the Rio de Janeiro (Vassouras) Observatory, 1913. 



'All values are referred to station A; A = B-\-\~t. 

 ^Half set; weight, 0.5. 



Referring the mean results to I. M. S. (see p. 273), we obtain: 



(21) I. M. S.-Rio de Janeiro (Cooke magnetometer No. 20)= +0'.5 (1913). 

 (21a) I. M. S.-Rio de Janeiro (Cooke magnetometer No. 20)= -0.00029// (1913). 



NO. 22. ROME OBSERVATORY. ITALY. 



The comparisons of the magnetic instruments of the Ufficio Centrale di Meteorologia 

 e Geodinamica at Rome with the standards of the Carnegie Institution of Washington 

 were made near Terracina, Italy, in 1911, and again in 1913. Two stations, designated A 

 and B, were occupied on the rifle range southwest of Terracina. Station A is 64.5 meters 

 east-northeast of northeast corner of target pit and G4.5 meters northeast of center of top 

 step of flight leading into target pit at its northwest end; the semaphore on Cape Circello 



