42 REPORT—1848. 
Geneva being ‘89 inch. We have consequently two sections of the ante- 
rior slope of crest No. 1, that from Geneva to St. Petersburgh cutting the 
wave more transversely than the other. These observations also enable us to 
determine with more precision the longitudinal direction and extent of this 
crest, for we now trace it from Belfast across the centre of England, through 
France to Geneva. It appears to have been depressed in France by the 
anterior trough of crest No. 2. 
While we thus have the anterior slope of wave No. 1 covering the northern 
parts of Central Europe, and being distinctly terminated on a line parallel 
to its crest, passing through or beyond St. Petersburgh and to the north of 
Christiania, so that from the crest to this line the pressure diminishes, we 
have the posterior slope of the preceding wave passing off towards the 
north-east, as shown by the Alten observations, which exhibit a greater 
pressure than those at Christiania. We have also, crossing these waves, two 
anterior slopes, one in Scandinavia and Russia, extending from beyond Alten 
to the north-west to beyond St. Petersburgh to the south-east. It is this 
slope that produces a considerable rise in the barometer at Alten, and from 
this station to St. Petersburgh it measures °69 inch. This anterior slope 
is distinctly terminated longitudinally by a line passing between the Orkneys 
and Christiania. The other anterior slope alluded to is that of the wave 
designated crest No. 2; it appears to be terminated on this day by its an- 
terior trough in the neighbourhood of Paris. The crest is considerably to 
the north-west of Great Britain and Ireland. 
On the 2nd of November we find the posterior slope of the wave preceding 
crest No. 1, more distinctly developed at Alten with its proper wind S.E. ; 
we also find the N.W. andS.E. parallel currents fully established from Great 
Britain and Ireland to Alten, as under :— 
vee Galt «ope 
Posterior slope of wave-crest No. 0* S.E. at Alten. 
Anterior slope of wave-crest No. 1. N.N.W. at Christiania. 
Posterior slope of wave-crest No, 1. S.E. Great Britain and Ireland. 
The anterior slope of the Scandinavian wave from Alten to St. Peters- 
burgh is very distinctly developed on the 2nd, possessing, although not to so ~ 
great an extent, the marked diminution of pressure towards its anterior 
trough which obtains between St. Petersburgh and Lougan on the 8rd. 
Nov. 3. The crest of the Scandinavian wave now transits Alten and its 
anterior trough Lougan, so that we have the whole of European Russia and 
Scandinavia covered by its anterior slope, The wave-crest No. 1 appears to 
occupy a position nearly coincident with the line terminating this wave longi- 
tudinally ; and the wave-crest No. 2, which receives its greatest development 
in Central Europe, approaches from the north-west, so that the three waves — 
- contribute to produce high barometric readings in the north-west of Europe, 
the area of greatest pressure, as indicated by readings above 30 inches, ex- 
tending from Alten and St. Petersburgh across the Scandinavian peninsula 
and Scotland to the north of Ireland. 
Nov. 4. The Scandinavian wave rolls onward towards the south-east, 
depressing the barometer at Alten and raising it at Lougan. The wave- 
crest No, 2 of Central Europe approaches from the north-west, raising the 
barometer in Great Britain and Ireland. The wave-crest No. 1, a south« 
westerly wave, still crosses the Scandinavian peninsula, keeping up the — 
te nll 
Se 
6th "paste 
=" ie 
* This symbol is employed to designate the wave preceding the south-westerly waves 
determined by the discussion of Mr, Brown’s observations. See Report, 1846, pp.140 to 160. — 
