484 



Tides of the Oceans 



small variation in phase in the following five vast regions when again the 

 disturbances caused by the shelf are neglected: 



(1) Western Region: the entire African coast from the Southern Atlantic 

 Ocean via Cape of Good Hope up till north of Ras Hafun in Italian East 



\fj»r 60° 30° 0° 30° £ 



W 60° 30° 0" 3u° E 



Fig. 203. Co-tidal lines for the Atlantic Ocean for the semi-diurnal tides (M 2 and S 2 are 

 together; referred to Greenwich) (Sterneck, 1920). 



Africa, including ihe west coast of Madagascar, the Comoro Islands, Amirante 

 Island, and Seychelles. The phases all lie near 0°. 



(2) Eastern Region : the west coast of Australia north of Freemantle across 

 the entrance of the Timor sea to the centre of Java; the phases are about 45°. 



(3) Between the western and eastern regions in the middle of the ocean 

 there seems to be a wide band, in the north-south direction along which the 

 phase remains constant at about 240°. It starts in the north near the southern 

 Maldive Island and runs across the Chagos Arch, Rodriquez, St. Paiil, 



