MAGNETIC SURVEY OF JAPAN. 22Ö 



meun Horizontal Force obtained by Mr. Scbiitt for the same region i.s 

 .30717, the mean of two determinations for Tokyo l)eino- .30743. 

 This vaUie is so mucii hirgcr than all other values ever ol)served by 

 ditfererit experimentahsts, that we are ainnjst forced to regard it as 

 erroneous, and to refer tiie discre[xiney to some uncorrected instru- 

 mental error. No other measurement of îlie Horizontal Force in or 

 near Tokyo has given a vahie grentin- than .3 — usually indeed from 1 

 to 2 per cent smaller. 



So far, then, we have no sure e\i<lcnccof any marked secidar 

 variations. It remains to compare the results of the present survey 

 with those obtained by Messrs. Sekino and Kodari during the winter 

 months of 1882 and 1883. As îdready mentioned their Survey was 

 not conducted with a due rejj-ard to a fair distribution of Stations 

 over the whole country. Many of our Stations accordingly lie quite 

 outside tlie routes pursued by them. Indeed of our 81 stations only 

 27 can be regarded as coincident with any of theirs. A few of these 

 are only roughly coincident, but near enough to allow of a compari- 

 son being instituted. The following is the list of these 27 Stations. 

 It will be noticed that after some of these, bracketted names are 

 inserted. These bracketted names üive ^Ir. Sekino's stations which 

 are near enough to ours to warrant a compiu'ison being made. 



List of Common Stations. 



Hakodate, Aomori, Nobechi, Gonohe, Morioka. Hanamaki, Ya- 

 magata, Yonezawa, Niigata, Ebisu, Ishinomaki, Shiogama, Shiraishi, 

 Ishibashi, Shimmachi [ Takasaki ], Shimizu [ Ukitsu, Shizuoka], 

 Nagoya, Hyögo [Koljc], Köchi, Hiroshima, Fukuoka [ Koyanose, 

 Yamae], Saganoseki, Hososhima, Miyazaki, Nagasaki, Yatsushiro 

 [ ]\Iiyanobania ], Shioya [ Komegawaki ]. 



