ON ATMOSPHERIC WAVES. 151 
November 13, 1842. 
Crest No. 2. 
S.W. N.E. 
Crest No. 5. 
N.W. S.E. 
Anterior slope, Crest No. 5. 
Max. Paris ...... 29°53 London...... 29:26 
Plymouth .. 29°46 Shields ...... 29°24 
Cork fk 29°40 Orkneys .... 29°35 
Belfast .... 29°27 Christiania .. 28°94 
Slope—Line of greatest diminution of pressure. 
Anterior slope, Crest No.5. Paris to Christiania.. *59. 
Trough succeeding Crest No. 2. Between Paris and Orkneys. 
Trough between Crests Nos. 3 and 5 now transits Christiania. 
Currents.—Wind on S.E. side of trough No. 2, S.W. 
2? rm 9? 39 ”» ”? 
The anterior slope of crest No. 5, the third wave of the S.W. system, is 
well-developed; but the prevailing winds are those due to the S.E. and N.W. 
sides of the trough succeeding crest No. 2. 
It appears from a consideration of the continuation of the tables appended 
to Nov. 8, that one or two small waves rode in the trough succeeding crest 
No. 2, which entered on the area on the 9th, and most probably traversed it 
during the next four days, presenting the same slowness of motion as the 
crest itself. : 
Symmetrical Wave.—London is situated under the anterior slope of crest 
No.5 and the posterior slope of crest No. 2, and falling either from the latter 
slope or the posterior slope of one of the small waves riding in the deep 
trough. 
November 14, 1842. 
Crest No. 5. 
N.W. S.E. 
Crest No. 4. 
. S.W. N.E. 
Max. Belfast ......-- 29°91 
Shields ......-- 29°82 Near the Crest No. 5. 
London......-. 29°80 
Orkneys ....-- 29°76 d 
Glsiute BN mini" Sy Under anterior slope, No. 5. 
Plymouth ...... 29°68 ; 
ee aT oe Under posterior slope, No. 5. 
Cork. .antiaties: 29°60 
Slope—Line of greatest diminution of pressure. 
Anterior slope, Crest No. 5. Belfast to Christiania... *56. 
Currents.—Wind on advancing slope of Crest No.4, N.E. 
ij N.E. side 3 5 5, N.W. 
” S.W. ” ” ” 5; S.E. 
The crest No. 5 now passes over Great Britain and Ireland much in the 
same direction as the crests Nos. 1 and 3 (compare Nov. 1 and 10). Its 
altitude is about -25 higher than that of the last S.W. crest; the advancing 
slope of the second N.W. wave has approached, raising the present crest. 
