*410 



These letters give an account of the observations on the wind made at 

 Armagh and Dublin during the gale, and it appears to me that they 

 completely establish the non-cyclonic character of the storm of the 29th 

 October. 



The wind in Dublin blew steadily from the S. W. during and long 

 after the gale ; while in Armagh (as appears from Dr. Robinson's letter, 

 or from the accompanying drawing, which I have made to represent the 

 observations) it seems to have shifted through 132° from 10 a.m., to 1 p.m. 



The gale in Dublin was at its height at 11 a. m., wlien the wind tra- 

 velled at the rate of 16 miles per hour. 



PerpendiQulars drawn to the directions of the wind at this hour, 

 from Dublin, Armagh, and Ballinasloe, nearly intersect in Lough 

 Melvin (A), in the county of Fermanagh, — a circumstance which, at 

 first sight, would seem to prove that the storm was a Cyclone. Eut if 

 a line BA be drawn, parallel to the bisector of the angle between the 

 wind directions of Armagh c.t 10 a. m. and 1 p. m., it is well known that 

 the gale, if a Cyclone, must have travelled along the line BA. 



