484 



MK MILNE ON TWO STORMS WHICH SWEPT OVER 



or very shortly thereafter, the barometer naturally reached its lowest point. But, 

 as the storm passed to the northward, the other causes which combined with tem- 

 perature to lower the mercury also passed away, and thus allowed it to rise again. 



It was observed in the second storm, as well as in the first, that it was when 

 the wind had veered to the S. or SW. that the barometer every where reached 

 its lowest point. At Greenwich Observatory, the wind is registered SE. by S. 

 at 2 p. yi. on the 28th, and it had veered to SW. by S. before i) o'clock next morn- 

 ing, the barometer having reached its minimum point in the interval. At Paris, 

 the wind at 9 p. m. on the 28th was S.SE., and before .9 next morning the 

 wind had veered to S.SW., during which interval the barometer reached its mi- 

 nimum. At Adare Abbey, the barometer reached its minimum about 4 p. m. on 

 the 28th, at which period the wind had veered to SW. ft-om S. by E. Similar 

 results are indicated by the registers of all the other places of which I have ob- 

 tained extracts, viz. Kinfauns, Abbey St Bathan's. Carlisle, Castle Toward, In- 

 veresk, &c. When the centre of the storm came nearest to any of these places, 

 the wind, according to the rotatory theory, must (if the storm was moving N.NE.) 

 have been blowing about S.SW., which actually was the direction of the wind 

 at these places, when the barometer reached its lowest point. The south-westerly 

 blasts were thus an indication to the places swept by them that the storm's 

 centre was then passing nearest to them. Other reasons also conspire to make 

 the barometer reach its minimum, during the prevalence of a south and south- 

 westerly wind. The south wind is necessarily warmer than any other ;. and if 

 the storm to which it belongs, happens to be advancing in a direction due north, 

 it will have a greater velocity than any other, combining its own circulai' motion 

 with the progressive motion of the storm. If the storm has a NE. direction, it 

 will of course be the SW. wind which will have the greatest velocity. 



Perhaps it might, in this view, be considered that some test of the direction 

 of the storm in its progressive course would be indicated by the wind which blows 

 strongest at a given place. The particular winds which, in the second of the 

 storms above described, Avere the most violent at different places, are stated in 

 the following Table : — 



* The direction of the strongest wind at Coloony and Castle Toward, is taken from the way in 

 which the trees blown dovyn there, were lying. The direction and force of the wind at the other places 

 are derived from meteorological registers. 



