154 REPORT—1846. 
Posterior slope, Crest No. 4. Anterior slope, Crest No. 7. 
Max. London.... 30°53 Max. London .... 30°53 
Shields .... 30°42 Christiania.. 30°11 
Belfast .... 30°37 : 
Corks sain. 80°18 
Orkneys .. 30°18 
Slopes.—Lines of greatest diminution of pressure. 
Posterior slope, Crest No.4. London to Cork...... "35 
” ” 39 ” 4. ” Orkneys. evbya *35 
Anterior slope, Crest No. 7. _ ,, Christiania.. °42 
Currents.—Wind on posterior slope of Crest No. 4, S.W. 
A few S.E. directions indicating the posterior slope of Crest No. 7. 
The crest No. 4 has advanced with considerable rapidity as compared with 
No. 2. It now passes London. The depressions to Cork and the Orkneys 
are equal; these lines are on the posterior slope; the crest No. 7 rises between 
the stations. This crest appears to have a very slow motion ; its anterior slope 
is well-seen in the diminution of pressure from London to Christiania, =-42. 
Crests Nos. 4 and 7 cross at London. 
Symmetrical Wave.—The crest passes over London; it is identical with 
the crest No. 4. 
November 19, 1842. 
Crest No. 7. 
| 
Crest No. 4. 
S.W NE. 
( 
Max. Paris ...... 30°17 i 
Pitincutl 4, 80:1 i Under anterior slope, Crest No. 9. 
London .... a0 06) Under anterior slope, Crest No. 9, at a 
Bristol .... 29°98 > lower level 
Cork ...... 29°92) ; 
Belfast .... 29°86 
aiths /Bhidkisitiy< at Near the trough between 9 and 7. 
Orkneys.... 29°91 ‘ 
Ghirinteg net Saat Under posterior slope, Crest No. 7. 
Slopes.—Line of greatest diminution of pressure. 
Paris to Shields.... °40 
Currents.—Wind on posterior slope, No. 4, S.W. 
” ” ” ” Te S.E. 
Symmetrical Wave.—London is situated under the posterior slope of crest 
No. 4 and anterior slope of crest No. 9, not far removed from the preceding 
trough. 
The crest No. 4 has now passed considerably to the S.E. of Paris, which 9 
exhibits the greatest pressure ; the posterior slope extends in the direction to- _ 
wards Belfast, although Shields is the minimum point. The trough between — 
crests 7 and 9 passes somewhat near Belfast and Shields. 
