— 233 — 



Jan Mayen, Fort Rae, Point Barrow, Novaja 

 Semlja and Ssagastyr. The vector moves more or less 

 regiilar}' in an anticlockwise direction; at the hours after 

 midnight and noon it is larger Ihan at about midnight and noon. 



This latter feature is strongly developed at Bossekop, 

 whence the diagram for this station exhibits a very oblongated 

 form. 



At Sodaukyla the southern parts of the diagram seem to 

 have crossed each other, so the diagram takes a cracknel-form. 

 During nighttime the vector moves clockwise again and 

 vanishes when the rotation changes. 



Pawlowsk. The vector moves anticlockwise in the morning 

 and clockwise in the afternoon, though the diagram does 

 not sliow a cracknel-from. but is partially curved inwardly, 

 and approaches the phiin form of the Greenwich-diagram, 

 where the vector rotates regularly for almost the whole day 

 in a clockwise direction. 



Tiflis. The direction is anticlockwise for the tirst part of 

 the day and clockwise d uring the second part, the diagram 

 showing cracknel-form and the vector vanishing before 

 midnight and before noon. 



Also for Washing^ton such a diagram lias been found, 

 but of a more complicated character, evidently an effect of 

 insufficiënt material. Xotwithstanding the vector rotates anti- 

 clockwise regularly from 4''a till 4^p. 



Zi Ka Wei. The diagram may be compared with that of 

 Sodaukyla. For l)Oth stations the diagram is so oblongated 

 that the vector may be said to keep a constant direction, 

 changing only in amount. This direction is nearly N/S for 

 Sodanhjla, but more E/W' for Zi Ka Wei. 



Batavia The diagram is almost the same as that for 

 Tijlia, only that the vector vanishes in this case shortly 

 after midnight and noon. 



The diagram of our most southerly station Cape Hoorn 

 shows nearly the same features as that for Greenirivli. 



These stations for which diagrams have been described, 



