ON ATMOSPHERIC WAVES. 143 
November 3, 1842. 
Crest No. 1. 
N.W.——_——_———_S..E. 
Crest No. 2. 
S.W. N.E. 
Posterior slope, Crest No. 1. 
Max. Christiania... 30°31 Bristol .... 29°96 
Orkneys.... 30°24 Plymouth .. 29°91 
Belfast .... 30°18 »Cork....... 29°83 
Shields .... 30°10 Paris......% 29°73 
London .... 29°96 
Slope.—Line of greatest diminution of pressure. 
Posterior slope, Crest No. 1, Christiania to Paris...... 58 
Currents——Wind on S.W. side of Crest No. 1, S.E. 
ie S.E 5 ce 2, N.E. towards trough. 
” N.E. 5; » 1, N.W. Christiania. 
The crest No. 1 is now approaching Christiania. The observations of 
this day offera decided contrast to those of the 1st; the posterior slope of 
crest No. | is well-developed, the point of greatest pressure being to the 
west of Christiania: the point of least pressure is still Paris, where the 
barometer has been falling since the 1st: this station appears to be near the 
intersection of the troughs of both waves. The progress of the maximum 
point is extremely interesting. On the 1st we find it at Belfast, on the 2nd 
at the Orkneys, and on the 3rd at Christiania; the direction of the progres- 
sion is consequently undoubted. The general direction of the wind over 
England, Scotland and Ireland, is ‘S.E.; that due to the posterior slope, at 
Paris and in the South-east of England, the wind is E. and N.E., the anterior 
slope of crest No. 2. 
November 4, 1842. . 
Crest No. 1. 
N.W.———_————__ SE. 
Crest No. 2. 
S.W.———————_NE. 
Anterior slope, Crest No. 2. 
Max. Orkneys.... 30°49 Plymouth .. 30°15 
Belfast .... 30°45 Bristol .... 30°14 
Christiania... 30°37 London .... 30°13 
Shields .... 30°34 Parigy 21.0. chee 29:80 
Cork ..... . 30°16 : 
Slope.—Line of greatest diminution of pressure. 
Anterior slope, Crest No. 2, Orkneys to Paris...... °69 
Currents.—Wind on S.W. side of Crest No. 1, S.E. at a few stations. 
ee S.E. 4s » 2, N.E. 
The anterior slope of crest No. 2 is well-developed, and the evidence of 
__ its extending over the whole of the British islands extremely strong ; also the 
_ establishment of its proper wind N.E.; a few stations exhibit the S.E. wind 
as the posterior slope of crest No. 1 is passing off. The line of the greatest 
diminution of pressure is identical with that of the 2nd, namely, Orkneys to 
Paris, but it is nearly doubled in value, being now equal to ‘69, showing 
that the greatest curvature is approaching. 
The crest No. 1 appears now to be over Christiania, or a little to the east of it. 
