

\Jm\ 



ATMOSPHERIC WAVES 



[Sect X. 



this reriicark has especial reference to the passage throuo-h 

 the Straits of Gibraltar, where, if possible^ hourly obser- 

 vations should be made. 



a, or Australia, observ?4ons at 



The Indiajiand Southern Oceans. Outward and home- 

 ward bound. — On sailing from the Cape of Good Hope 

 to the East Indies, Chin 

 intervals of three hours should be made until the 40th 

 meridian east is passed (homeward-bound vessels should 

 commence the three-hourly readings on arriving at this 



meridian). Upon leaving the 40th meridian the six- 

 hourly observations may be resumed on board vessels 

 bound for the Indies and China, until they arrive at the 

 equator, when the readings should again be made at 

 intervals of three hours, and continued until the arrival 

 of the vessels in port. 



With regard to vessels bound for 



New 



^ 



^^ 



be continued from the 4utJi to the 100th meridian, and 

 upon the vessels passing the latter, the three-hourly read- 

 ings siiould be com-menced and continued until the vessels 

 arrive in port. Vessels navigating the Archipelago, 

 between China and New Zealand, should make observa- 



X X- ^ 



tions 



s 



5 



every three hours, in order that the undulation 

 arising from the configuration of the terrestrial and 

 oceanic surfaces may be more distinctly marked and more 

 advantageously compared with the Gulf of Mexico, the 

 Caribbean Sea, and the northern portion of the African 

 continent. 



lite Pacific Ocean. — As this ocean presents so vast an 

 aqueous surface, generally speaking observations at in- 



I 

 \ 



\ 



\ 





^<- 



tei 

 its 



ap 

 or 



ho 

 efl 



th> 



su 



th^ 



1 



re. 

 he 



ID: 



N 



bo 



th. 



re 



fo 



cc 



m 

 tr 



di 



ol 

 tl 

 ei 

 bi 



1 



ij 



vi 



