The Rev. H. Lloyd on the Meteorology of Ireland. 



45S 



At Markree tlie gale commenced at 4''- 30'"' p. m. of the 18th, witli a rapidly 

 faUing barometer. At 7 p. m. the wind abated to a breeze, the barometer still 

 falling. It recommenced at 10 p. m. from the S. E. ; and at 3 a. m. on the 19tli 

 it appears to have attained its maximum. At 6 a. m. the wind again abated; 

 and at 7 a.m. there teas a calm. Tlie minimum pressure took place at this time, 

 and amounted to 28"170 inches. At 9 a.m. the wind rose again from the 

 N. N.W., but not with such force as before; and in the afternoon there was 

 a strong gale again.* 



From these facts it is evident, that the centre of the vortex passed nearly over 

 Markree at 7 a.m ., and over Armagh at ll*- SO"- a. m. At Donaghadee, which 

 is nearly in the prolongation of the line connecting the two former places, the 

 wind ceased at 1 p. m., and recommenced at 5 p. m. ; so that the vortex passed 

 nearly centrally over this station at about 3 p. m. From these data we learn 

 that the cyclone moved from W. S.W. to E.N.E. ; and that the velocity of the 

 progressive movement was then about 12 miles. per hour. 



* The following are the extra observations at Markree above referred to. 

 meter to sea-level = + 0'161 inch: — 



Reduction of baro- 



3 n2 



