!Mr. W. 11. Birt on Atmosph 



eric Waves, 





Fourth zone above posterior tro 



ugh. S.W. 



wave. 



Baron). 



Direction. 



Force, 



Toulon . . 29-63 + 0-16 



S.W. 



—4 



Lyons . . . 29-61 + 0-28 



S.E. 



2 



Charleville . 29-34 + 0-08 



E.S.E. 



+ 6 



Paris . . . 29-31 + 0-1 5 



S.E. 



-2 



Cape Oris Nez. 29-24 + 009 



S. 



-3 



Dover . . . 29-22 4-0-06 



S.W. 



-4 



London . . 29-20-0-01 



s. 



-4 



Liverpool . . 29-22-0-31 



E.S.E. 



-2 



Ardrossan . . 29-36-0-34 



E.N.E. 



7 



133 



Trough of N.W. wave between London and Liverpool. The 

 S.E. winds in France were those of the posterior slope of the 

 S.W. wave. The E.S.E. wind at Liverpool was part of the cy- 

 clonic stream of air drawing round the area of least pressure. 

 The apparent stationary character of the barometer at London 

 would indicate that the trough of the 21st remained in the 

 neighbourhood during the elapsed twenty-four hours ; but it is 

 uncertain. This shows that the telegrams to the Meteorological 

 Office should be forwarded at shorter intervals. 



Fifth zone above 



the posterior tn 



9Ug/i. S.W. 



wave. 



Brussels 



29-32 + 0-10 



S.E. 



+ 6 



Yarmouth . . 



29-27-0-12 



S.S.E. 



-4 



Scarborough . 



29-25-0-26 



S. 



-2 



Shields . . . 



29-28-0-30 



E.N.E. 



+ 6 



Leith . . . 



29-42-0-25 



N.E. 



+ 8 



Aberdeen . . 



29-51-0-19 



N.E. 



+ 9 



Nairn . . . 



29-60-0-18 



E. 



+ 6 



Wick . . . 



29-68-0-14 



E.N.E. 



-4 



Thurso . . . 



29-67—0-14 



N.E. 



+ 5 



Trough of N.W. wave between Yarmouth and Scarborough. 

 The winds at Brussels^ Yarmouth, and Scarborough appear to 

 have been those of the S.W. wave, while all to the N.W. of 

 Scarborough were those of the anterior slope of the succeeding 

 N.W. wave. 



Sixth zone above the posterior trough. S.W. luave. 

 Cuxhaven .... 29*33 



0x0 29-52 



Skudesnaes . . . 29-56 



Christiansund . . . 29*80 



This Table, in conjunction with the weather-maps, brings out 



with great distinctness the conteoiporaneity of no less {\i?ix\ four 



independent (?) atmospheric arrangements. Firsts circular zones 



of pressure around the lowest point, extending from 28'9 to 



w. 



2 



N.E. 



4 



V.N.K. 



4 



Calm. 





