342 



DEPARTMENT OF THE NATAL SERVICE 



Table 6. — The amount of solenoids per 10 km., equivalent to a velocity of the 

 current of 1 cm /sec, at different latitudes. 



Table 7. — Correction in cm. of level of water under atmospherical pressure. 



(a) MILLIBAR. 



m.bar. 



940 



950 



960 



970 



980 



990 



1000 



1010 



1020 



1030 



1040 



-51 

 -41 

 -31 

 -21 

 -11 

 - 1 

 9 

 19 

 29 

 39 

 49 



