

( 54 ) 



[Sect. II 



Section III. 



HYDROGRAPHY. 



Y CAPTAIN P. W. BEECHEY, K.N. 



r 



Milking a Passage. 



The observer's attention is directed first to those objects 

 which aiFe<;t the passage of a vessel from one part of the 



jlobe to another ; such as the movement, the duration, 

 the limits, and the periodic occurrences of those gi-eat 

 currents of the atmosphere and of the ocean, upon which 

 the speedy and successful issue of a passage mainly 

 depends. 



Well recorded and established facts bearing upon the 

 several points connected with these inquiries are highly 

 irniortant to navigation, and m.ay be collected by every 

 assiduous seaman in the ordinary course of his duties. 



1. It is well known that in various parts of the globe 



there exist monsoons, and zones of trade and variable 



and other disturbances of tli. 



wind 



" ; and that these 



atinospheru which influence the surface of the ocean are 



the 



principal causes of the many currents which sweep 



over the face of the earth. The 



1 



.se upon a 



Tessei passm 



of 



• » 



quiries a seaman 



r\ 



(wind 



'J 



rent) perform an important part in the economy of nature 



I 



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note 



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any 



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w 



hil" 



any 

 usua 

 advii 

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2. 



tion 



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be c 

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 ship' 



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