Comparisons of Magnetic Standards, 1905-14 



255 



is in true bearing 67 25'.3 W. of S. Station B is 47 meters south-southwest of station A, 

 18 meters north-northeast of northeast corner of target pit and 20.5 meters northeast of 

 center of top step of flight leading into target pit at northwest corner; it was marked by 

 tent peg driven flush with ground. The true bearings of marks at B are: semaphore on 

 Cape Circello, 67 34'.4 W. of S.; cone-toppod tower on hospital in Terracina, 227 09'. 6 

 W. of S. The azimuths given are the mean results of all observations in 1911 and 1913. 

 The instruments used by Director Palazzo were DoN'er-Schneider magnetometer No. 

 122, and Dover dip circle No. 51 (needles 1 and 2 in 1911, and needles 1, 2, 5, 6, 15, and 16 

 in 1913).' The C. I. W. observations were made in 1911 by Mr. W. H. Shgh, using C. I. W. 

 magnetometer No. 7 and Dover dip circle No. 202 (needles 1 and 2) ; in 1913 the observer 

 was ^Nlr. W. F. Wallis, who used C. I. W. magnetometer No. 10 and Dover dip circle No. 

 202 (needles 1, 2, 5, and 7). 



Table 22 A. Results of Declinalion Comparisons at Rome {Terracina), 1911 and 1913. 



Series 



II 



Date 



1911 

 Oct. 20 

 20 

 20 

 20 

 20 

 21 

 21 



Mean. 



1913 

 Nov. 12 

 13 



16 



17 



Mean. 



Local mean time 



From ! To 



h m 

 10 32 



10 51 



11 08 

 11 27 

 11 47 

 16 42 

 16 58 



h m 



10 41 



11 00 

 11 17 

 11 36 

 11 56 



16 51 



17 07 



Decimation obtained' 



C.I.W. 



-8 22.2 

 22.4 

 23.7 

 24.2 



24.8 

 22.5 

 22.6 



Rome 



Mean value of (C. I. W. Rome) from I and II ! -|-0.2 



Remarks 



C. I. W. magnetometer 7 at B; 

 Rome magnetometer at A. 



C. I. W. magnetometer 7 at .4.; 

 Rome magnetometer at B. 



Weight, 1.0. 



C. I. W. magnetometer 10 at B; 



Rome magnetometer at A. 

 C. I. W. 10 at A; Rome at B. 

 C. I. W. 10 at B: Rome at A. 



Weight, 1.0. 



'All values are referred to .4; 

 height, 4.0. 



.l = B-0'.4. 



'All values are referred to A; A = B-{-O.Oy. 



'Director Palazzo states in his letter of September 16, 1913, that he found it necessary to have all the axles of the 

 needles of dip circle No. 51 renewed in 1912 by Dover. 



