rm 



Natural Hizc. 



MAGNETIC SURVEY OF JAPAN FOR THE EPOCH 1895.0. lo 



their lowest ends are nearly 2 cm. apart, so that its moment of 

 inertia about the vertical axis is less than 0.0003 gr. cm.'- and 

 is neglected in the calculation. 



The inclination of 

 the magnet is adjusted 

 by movins; the small 

 tie E in Fig. 2 within 

 fraction of a minute. 

 The magnet is subject 

 to a slight motion in the 

 vertical plane caused by 

 accidental distur ba n ces 

 of the air or ground 

 tremors. This effect as 

 well as that of the inclination upon the proper period of vibra- 

 tion was specially studied l)y making observations with large 

 amounts of those errors ])ur]iosely given, as follows : — 



Kogota July 1st. 1895. 

 Local Time Temperature y^brntion 



11" 



11" 



11" 



Observer H. !~>inzy(). 

 Recorder A. Tanakada'J'e. 



Remark. 



24'" A.M. 20^6 C. 5\8810 normal p.)sitiou 



41'" „ 20 .9 5 .8785 nortli end down 30' 



-,,,„ ^^,. r- ~ Qi-Qr^ (with motion in the vertical 



'^^ " ^^^-^ O.b/öü Ipiane, amplitude 30' to l.y 



2" ?àT P.M. 



Oh ooiii 



21°.5 C. 

 21 .2 



5*.8851 normal position 



" QQ~<i (with motion in the vertical 

 Ö .bbr),) Ipijine, amplitude 20' to W 



