440 



Magnetic Observations at Zi-Ka-Wei. [June 18, 



XVIII. " Magnetic Observations at Zi-Ka-Wei." By M. DECHEV- 

 RENS, Director of the Observatory. Communicated by the 

 Rev. S. J. PERRY, F.R.S. Received June 15, 1874. 



Stonyhurst Observatory, 

 June 13th, 1874. 



MY DEAR SIR, I enclose a report of some magnetic observations made 

 at the New Observatory of Zi-Ka-Wei with instruments which I sent 

 from England some time since. A complete set of self-recording mag- 

 netographs have just been completed for the same observatory by Mr. 

 A die, and will be forwarded to their destination this week. The Director 

 of the Observatory of Zi-Ka-Wei, as well as his first assistant, have both 

 received full instructions in the use of these instruments, so we may rea- 

 sonably hope that the science of terrestrial magnetism will be much 

 advanced by the foundation of this new establishment. 



Tours sincerely, 



S. J. PERRY. 



G. Q. Stokes, Esq., SecMJS. 



Premiers rcsultats concernant la Variation diurne de la Declinaison 

 k Zi-Ka-Wei (Chine). 



Observations faites le 23-24 et le 29 Mars, 1874, le 6 et le 

 12 Avril, 1874. 



[The above Table is accompanied by a figure with the results pro- 

 jected, and is followed by a magnetic bulletin for March 1874, .from 

 which the following mean results are extracted : 



Declination 1 53' 59"-8 W. 



Vertical intensity 7-22996 



Inclination. . . . '. 46 13' 13"-7 



Horizontal intensify 6-92833 



Total intensity 10-0137 



GL G. s.] 



