364 ON THE METEOROLOGY OF IRELAND. 



south-east at 6 p. M. Greatest velocity of wind (north-east) = 55 

 feet per second. 



Sept. 30, 9 A. M. Centre near Malin Head, at northern ex- 

 tremity of the island. Absolute minimum of pressure (= 29*020) 

 at Portrush ; increase of pressure = 015 inch. Mean velocity of 

 wind = 35 feet per second ; greatest do. (north-west) = 55 feet. 



Sept. 30, Oct. 1. Cyclone moving apparently in curvilinear 

 path, its course being at first from W. to B., until it reached the 

 centre of the island, and afterwards from S. S. W. to N. N. E. 

 Mean velocity of wind between 25 and 30 feet per second. 



Sept. 30, 9 p. M. General southerly current. Centre of vortex 

 to the west of the island ; least pressure on west coast. Greatest 

 velocity of wind (on west coast) = 45 feet per second. 



Oct. 1, 9 A. M. Centre of vortex over the island, between Kil- 

 rush and Courtown. Absolute minimum of pressure (= 28'838) 

 equally distant from Dublin, Courtown, and Dunmore. Northern 

 stations beginning to be affected by vortex. Greatest velocity of 

 wind (north-east) = 50 feet per second. 



Oct. 1, 9 p. M. Centre north of Portrush. Absolute minimum 

 of pressure (= 28'853) at Portrush ; increase of pressure = 0'09 inch. 

 At Donaghadee a sudden shift of the wind from S. S. E. to "W.took 

 place at 4 h 30 m P.M. 



Oct. 4, 5. Distinct cyclone moving fromW.S.W. to E.N.E., 

 and passing over (or near) the northern extremity of the island. 

 (Plate IV., figs. 4, 5, 6.) Mean velocity of wind = 35 feet per second. 

 General electrical disturbance. 



Oct. 4, 9 A. M. General current from S. W. ; centre of vortex 

 north-west of the island. Greatest velocity of wind (on west coast) 

 = 45 feet per second. 



Oct 4, 9 p. M. Centre close to northern extremity of the island. 

 Absolute minimum of pressure (= 29-182) at Portrush ; increase of 

 pressure = Oil inch. Greatest velocity of wind (north-west) = 55 

 feet per second. 



Oct. 5, 9 A. M. Centre north of the island ; least pressure at 

 Portrush. Greatest velocity of wind (in the north) = 60 feet per 

 second. 



