ON ATMOSPHERIC WAVES. 47 
Nov. 9. Crest at Geneva .........+022. 30°08 
Posterior trough at Belfast ...... 29°41 
Altitude of wave from posterior trough ‘67 
__ The Bardsey and Munich observations appear to give a higher value for 
the posterior slope. 
The preceding remarks have exclusive reference to the barometric move- 
ments over Central and Northern Europe during the first nine days of No- 
vember. Among the results obtained from combining the Alten observations 
with those before enumerated, we have the extension of the crest No. 2 
to the extreme north of Europe. In like manner it may be expected that 
the succeeding wave-crest No. 4 would also stretch across the European 
continent in the same direction, and that the Alten observations would con- 
firm the suggestion published at the end of my third report (Report 1846, 
p. 372), that this wave stretched to the very north of Europe. On con- 
‘sulting them we find the barometer passed.a maximum at 9 p.m. of the 18th, 
value 30°114. The epoch of this maximum, its value being considerably 
lower than those of the maxima observed in Central Europe about the 
same time, and the similarity that exists in this respect to the altitude 
of wave-crest No. 2 as it passed Alten, the greatest swell occurring in 
Central Europe, tends greatly to identify this maximum with wave-crest 
o. 4, and that the greatest swell of this wave also occurred in Central 
rope. 
q The following table exhibits the passage of crest No. 4 from Ireland to 
the eastern borders of Europe during the 17th, 18th, 19th and 20th of 
November 1842 :— 
a Taste VI. 
Epochs of the transit of Wave-crest No. 4, November 1842, 
Stations. Day. Hour. 
RSROOW om inia cia ale ait pid. sie teal | kd Noon*. 
uN, eos seein ace ecel Le 11 pM. 
CCED WIC, cigita sa sientaae | oa 10 a.m. 
RRISREIE ys g's waa Sieeifaete 4) (LE 6 P.M. 
eRe es Ee aaa e's «| Ee 9 P.M. 
MEPM OUR) T aic's Wouumtina a se s| | oe 9 amt. 
DIeGiCn tue matais sic. | ao 9f amt. 
Sf, Petersburgh si castes «|; 19 10. p.m. 
BOGPAR Seeraadek seeds. || 0 2 P.M. 
ble VIT., which is supplemental to Table I. facing page 36, embodies the 
ts of the examination of the barometric movements over the larger area 
specified, and includes the elements of the three prominent waves, 
and No. 1. 
collecting the results of the examination of these waves over the larger 
ea embraced by the observations at Alten, St. Petersburgh and Lougan, 
» The early transit of the maximum at Glasgow appears to have been connected with the 
nth-westerly wave-crest No. 7, which crossed No. 4 at Belfast; this is supported by the 
servations at Sir Thomas Brisbane’s Observatory, Makerstoun. 
As the observations at Geneva are not taken between 9 p.m. and 9 a.m., it is highly 
le the maximum occurred earlier, and that there was a longer interval between the 
8 of transit at Geneva and Munich than half an hour. 
