264 



Reports on Special Researches 



Table 27 D. Results of Horizonial-Inknsity Comparisons between C.I.W. Magnetometers Nos. S and 15 at Washinglon. 



'AH values are referred to station Am! Ajji = Cm-\-30y. 



-These are the vaKics obtained with C. I. W. No. 3 standardized. 



The following special results of earth-inductor comparisons will be of interest, as No. 4 

 was installed at the Mauritius Observatory in 1913. 



Table 27 E. Resulls of Compnrisons at Washington in WIS betxoecn Schulze Earth Induclor No./,Sand C.I. \V. Earth 



Inductor No. 4, Constructed for the Mauritius Observatory. 



(Method of alternate comparisons, using 2 stations, A and C, and e.\changing stations 



in middle of series; observer, H. W. F.) 



Local mean time 



Date 



1913 

 Jan. 15 

 15 

 15 

 15 

 15 

 15 

 15 

 15 

 16 

 16 

 16 

 16 

 16 

 16 

 16 

 16 



From To 



h m 



10 21 



12 00 



13 37 



14 30 



15 13 



15 52 



16 15 

 16 41 



11 01 



11 .37 



12 04 



12 26 



13 57 



14 40 



15 04 

 15 .30 



Inclination obtained' 



Schulze 48 



+70 55.9 

 55.4 



54.3 

 54.2 



56.2 



56.2 

 54.9 



54.6 



E. I. No. 4 



Schulze 48 

 E. I. No. 4 



Mean value of (Schulze No. 48 -C.I.W. No. 4) . 



+0.1 



+0.4 



+0.4 



+ 0.2 



+0.3 



Remarks 



Wo. 48 at .1; No. 4 at C. 



No. 48 at f; No. 4 at A. 



'All results are referred to station C; C=A + 1'.0; the values with No. 48 are as observed, i. e., 



without any correction applied, hence being practically I. M. S. values (see p. 273). 



NOS. 28 AND 29. ZIKAWEI AND LUKIAPANG OBSERVATORIES. CHINA. 



Both series of comparisons at the Zikawei Observatory in 1907 were made in the abso- 

 lute house {H) of the Observatory and at a second station (A^), distant 21.3 meters in a 

 direction 6 west of north from the pier in the absolute house. Series I was obtained at the 

 time of the visit of the Galilee in May 1907 to Shanghai; series II was obtained by Dr. C. K. 

 Edmunds, associated with the Department of Terrestrial Magnetism. 



The standard instruments of the Observatory were : Elliott magnetometer No. 49 and 

 Dover dip circle No. 33 (needle 14). The C. I. W. instruments used were: for series I, 

 C. I. W. magnetometer No. 1 and Dover dip circle No. 178 (needles 1 and 2) ; for series II, 

 C. I. W. magnetometer No. 2. 



