ON THE METEOROLOGY OF IRELAND. 



857 



therefore, briefly describe the series of changes at these two stations. 

 The observations at Armagh are taken from the records of the self- 

 registering anemometer, which were, of course, continuous; those at 

 Markree were made at short intervals. 



At Armagh the wind began to blow at 7 p. M. of the 18th, with 

 a velocity of 32 feet per second. The maximum velocity, with the 

 exception of a short squall* at 5 A. M., occurred at 7 A. M. of the 

 19th, and amounted to 43 feet per second. From this time the 

 wind abated rapidly almost to a calm, its velocity at noon amount- 

 ing only to 6 feet per second ; but at 3 p. M. it rose again, with a 

 velocity of 22 feet. The initial direction of the gale was from the 

 E. S. E. From 9 p. M. on the 18th, to 1 A. M. on the 19th, it veered 

 to S., at which point it continued for several hours, including the 

 period of greatest force of the gale. At 11 A.M. its direction had 

 returned to S. E., and it then suddenly shifted to W. N. W., alter- 

 ing through 160 in 24 minutes. The minimum of pressure took 

 place at ll h 30 m , at the close of this movement; its amount was 

 27-930 inches.f 



At Markree the gale commenced at 4 h 30 m P.M. of the 18th, 

 with a rapidly falling barometer. At 7 P. M. the wind abated to a 

 breeze, the barometer still falling. It recommenced at 10 p. M. 



During the squall, which lasted only three minutes, the velocity reached 90 feet 

 per second. 



t The following are the anemometric observations above referred to. The direction 

 is measured from S. through W. to N. ; the velocity is expressed in miles per hour. 

 On the 19th, from 4 A. M. to 8 A. M., the direction-registering pencil was thrown out of 

 gear, but there appears to have been no change of any magnitude in the interval: 



