Sect. X.j 



AND BAEOMETilTC CURVES. 



31 



rr 





*,^ 



^! 



P 



y * ^ 



iW 



i 



under the snperin- 



have six-hourly observations, made 



tendence of the Honourable the Corporation of the Trinity 



H 



Shi] 



)s in nearmor 



tl 





islands and niakins* the 



observations already pointed orit, will greatly assist in 

 determining the increase of osciilation proc 



ceding 

 of the two CTeat European 



ward from the nodal point 

 systems. We have already mentioned the service siirvey- 

 ing vessels employed on the coasts of Ireland and Scotland 

 may render, and the remaining portion of the area marked 

 out in the report may be occupied by vessels nayigatm 



Nor 



Ham 



merfest. 



In connection with these observations, having especial 

 reference to the European system of south-w^esterly atmos- 

 pheric waves, the Mediterranean presents a surface of con- 

 siderable interest both as regards these particular waves, 

 and the influence its waters exert in modifving tLv. » wo 

 great systems of central Europe, The late Professor 



r 



Daniell has shown from the Mannheim observations, that 

 small undulations, having their origin on the northern 

 borders of the Mediterx^anean^ have propagated themselves 

 northward, and in this manner, but in a smaller degree, 

 the waters of the Mediterranean have contributed to 

 increase the oscillation as well as the larger surface of thi 



' i 



northern Atlantic. In most of the localities of this great 

 inland sea six-hourly observations may suffice for this 

 immediate purpose ; but in sailing from Lisbon through 

 the Straits of Gibraltar, in the neighbourhood of Sicily 

 and Italy, and in the Grecian Archipelago, we should 





scries, as 



marking more 



a-' 



recommend the three-hourl 



distinctly the effects resulting from the proximity of kind ; 



■ 



