358 
REPORT—184?. 
At the commencement of the wave a posterior slope that extended tovsnii 
the north-west was indicated by the observations,— 
Jtamsgate. 
London. 
Arbroath. 
Jersey. 
HelstoDP. 
Limerick. 
It wojild appear that at stations south-west of Arbroath the barornw 
indicated a decrease of pressure, so that a posterior slojte contemporaDePi' 
with the one just noticed extended towards the south-west. Thai die cw ' 
of this last-mentioned slope passed near St. Vigeau's is extremely probebe 
from the superiority of the Stornoway to the Orkneys’ curve. Thisjuperf 
ority was maintained during the transits of the two maxima of the 9th 
12th : we have consetpiently the crest passing in the direction of Arbw 
to Stornoway, with a very slow motion towards the north-east 
The curves at Largs and Limerick bear testimoiiv to the same cooclusi*. 
throughout the whole of their course, with one or two very slight esceptw® 
the curv-e at Largs is superior to that at Limerick. The three stations, i’ 
bmath, Largs, Linu!rick, clearly indicate the presence of the posterior 
of this slowly-moving wave*. We have therefore— 
I. Thu posterior slope of a wave extending from north-east to soutb-wn 
Ilf l^sferior »Io 2 )e of a wave extending from south-eastto nortb-iw^ 
III. And a wave moving much mure rapidly than either coming from ib 
south-wMt, the crest passing over the area in about one day- 
This wave forms tlie second subordinate wave on the anterior dope* 
the great wave, point «, tig. 8. 
/lie next remarkable phamonienon that occurred was the traQ«iiof^f|' 
trough succeeding the posterior slope of the nortli-west wave (H-)- 
ook place about midnight of the 6th, as indicated by the intersection®^® 
curves at Jersey, Helstonu and Limerick (see fig. 8, first iiiteiwcf®'’ 
curves). The altitude of the inU^rsection was 30*05. As usual 
nsc occurred m the north-west; but uiion the transit of the crest i» ^ 
Uie greatest fall was observed in the soutli-east. The curves in fig-***® 
as the point of intersection, illustrate this. 
Jersey 
•12 
Helstone . 
