— 5 — 



The ratio of the force of gravity at Ogasawarajima to that at Tokio is 



as follows. 



/1.000718\- 



By B, I I =.999624 



^ VI. 000906/ 



099894\2 

 1.000087> 



„ C, =.999614 



/1.000089\2 

 „ E, I =.999636 



\1.000271/ 



If we take " g " at Tokio to be 979.84 the values at Ogasawarajima come 

 out as follows : 



979.472 (C. G. S. unit) from B 

 979.462 „ „ C 



979.483 „ „ E 



Mean 979.472 



From Leutke's observation and Baily's reduction, " g" at Ogasawara- 

 jima should be 979.388.* Leutke's values for the co-ordinates are 



tLat. 27° 4' 12" K 



Long 142° C E. 



thus differing 1" N and 11' 54" "\Y from the values for our station. 



Computed from the formulae. 



^ = 980.6056-2.5028 cos 2A-.000003 h (Everett) 

 17 = 978.0728 -t- 5.0875 siu= A (Listing) 



5r = 980.63 -2.553 cos 2^ (Major llerschel) 



g at 27° 4' 1 \" has the corresponding values 

 979.139 

 979.126 

 979.135 

 all of which fall short of the value wo obtained by about .034 per cent. 



In the spring of 1883 the pendulums used in the Indian Operations were 

 brought to Tokio University by ^lessrs. Smith and Prechet of U. S. Coast 

 Survey, and had tlieir vibration numbers per day determined. When these 

 results are published, wo shall bo able to got a better value for Tokio, and there- 

 fore for Ogasawarajima, Sapporo, Kagoshima and Naha, for all uf which places 

 relative determinations have now been made. 



• Sec Appendix of Memoir No. 5 (Sapporo excursion), 

 t U. T. .Survcj of India Vol. V. 



