A A. TANAKADATE. 



§ 2. Division of Work in each Year. 



In 1893 the middle part of Honsyü was surveyed by two 

 parties called for convenience the East Party and the West 

 Party. 



The East Party consisted of H. Omori, S. Nakamura, K. 

 Mizusima and H. Kimura and began its work on July 3rd. and 

 ended on Oct. 23rd. It made observations at 44 stations 

 covering the district between the island of Sado on the uortli 

 and the peninsula of Idu on the south, and from the Lake Suwa to 

 the plane of Sumidagawa across the other directions. It took 

 several observations on the active volcano Asama. 



The West Party consisted of A. Tanakadate, K. Turuta, 

 H. Iwaoka, and K. Üziie beside T. Noda who joined the Party 

 for half of the time. It began its work on July 1st. and ended 

 on Oct. 27th. and made observations at 47 stations in the district 

 extending between the peninsula of Noto on the north to the 

 harbour of Toba on the south, and from the shore of the Lake 

 Biwa to the eastern foot of Huziyama on which several observa- 

 tions were taken. 



This party had the mishap of breaking the spider line 

 suspension of the magnetometer at the first station after Tokyo, 

 and on repairing an unforeseen blunder was committed by using 

 too thick a fibre, the erroneous effect of which was discovered at 

 the station Gihu after making observations at 22 stations. This 

 affected the value of the horizontal intensity but a little, its 

 effect upon that of the declination was however too great to be 

 allowed ; hence A. Tanakadate left the rest of the party at 

 Turuga and made re-determinations of that magnetic element at 

 those stations except a few on the top of Huziyama. 



