Comparisons of Magnetic Standards, 1905-14 



225 



simultaneous. In obtaining the quantity (C. I. W. Batavia), tlie observations on each 

 day were, furthermore, grouped so as to ehminate as far as possible any outstanding effect 

 on account of diurnal variation. The decUnation correction (+0'.4) for C. I. W. magne- 

 tometer No. 4 wliich was applied to the observations by Dr. Edmonds, is uncertain by O'.l 

 or 0'.2. It is assumed that no error of consequence is to be attached to the value furnished 

 Dr. Edmonds of the angle (2' 52") used in referring the azimuth of mark from theodolite 

 pier to magnetometer pier. 



Table OB. Resulls of Horizonlal-Intensily Comparisons at the Batavia Observatory, 1911. 



'All values are referred to Observatory Pier A; A = C 97. 

 Table &CResxiUs of Inclination Comparisons at the Batavia Observatory, 1911. 



Local mean time 



Date 



1911 



Nov. 4 



4 



4 



4 



10 



10 



10 



13 



13 



13 



13 



13 



13 



13 



From 



To 



h m 

 19 07 

 19 49 

 21 03 

 21 47 

 19 16 



19 41 



20 27 



20 40 



21 26 



22 14 



22 50 



23 28 



23 54 



24 34 



h m 



19 44 



20 30 



21 45 



22 22 



19 37 



20 04 



20 58 



21 18 



21 54 



22 40 



23 08 



23 50 



24 16 

 24 55 



Inclination obtained 



C. I. W. 



Batavia 



-31 19.1 

 19.4 



18.0 



20.9 

 20.0 



19.4 



Inclination reduced to 

 fixed readings of Wild 

 H and Z variometers 



C. I. W. 



Batavia 



-31 18.8 

 19.0 



17.6 



18.9 



18.8 



18.6 



Mean value of (C. I. W. Batavia). 



C.I.W. -Batavia 



-0.2s (weight 3) 



-0.38 (weight 3) 



-0.3 



Assembling the chief results and referring them to I. M. S. (see p. 273), we obtain: 

 (6) I. M. S.- Batavia (Meyerstein unifilar)= +0'.5 (191 i). 

 (6a) I. M. S.- Batavia (Jones magnetometer No. 1)= +0.00122// (191 1). 

 (6b) I. M. S.- Batavia (Schulze inductor No. 47)= +0'.2 (1911). 







