334 



ox ATMOSPHERIC WAVES 



' [Sect. X. 



Sec 



II. The Norf hern portion of the African Contineiit^ in- 

 cluding the Sahara or Great Desert. — This vast radiating 

 surface must exert considerable influence on the waters 

 on each side northern Africa. Vessels 



sailin 



area comprised between 40^ west and 70° east and the 

 equator and the 40th parallel, should also make observa- 

 tions at intervals of three hours. 



III. The great Eastern Archipelago. 

 somewhat similar character to the western ; like that, it 



presents .i 



is the region of terrific hurricanes, and it becomes a most 



interesting object to determine its barometric phenomena ; 



the three-hourly system of observation may therefore be 

 resorted to within an area comprised between the 70th 

 and 140th meridians, and the equator and the 40th 

 deoTec of north latitude. 



n 



The southern hemisphere also presents three important 

 localities, the prolongations of the three tropical areas. 

 It is unnecessary to enlarge upon these, as ample instruc- 

 tions have been already 



iven. 



^^ 



may, however, 



remark, with regard to Australia, that three-hourly 

 observations should be made within the area comprised 

 between the lOOth and 190th meridians east, and the 

 equator and the 50th parallel south, and hourly ones in 

 the immediate neighbourhood of all its coasts. 



, HUKRICANES, AND TyPHOOIsS. 



The solution of the question— How far and in what 

 manner are storms connected with atmospheric waves ?— 

 m.ust be extremely interesting to every one engaged in 

 either the naval or merchant service. It is foreign to the 

 purpose of these instructions to enter into any examina- 



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