280 Mr. W. Brown on the Oscillations of the Barometer. 



Names of Places. 



Orkneys ... 

 Glasgow ... 

 Belfast ... 

 Armagh ... 

 Shields ... 



Cork 



Bristol ... 

 Plymouth 

 London ... 



Paris 



Christiania 



21. 



•00 



+•02 

 +•10 

 +•10 



+•04 

 +•04 



+•15 



+ 03 



+•01 



•00 



-•06 



-•01 

 -•01 



+•02 



-•18 

 -•20 



-•31 



-•12 



-•07 

 +•01 



+•12 

 •00 



22. 



-•30 

 -•40 

 -•53 

 -•23 

 -•36 

 -•25 

 -•46 

 -•34 

 -•40 

 -•32 

 +•02 



•00 



-•12 



•00 



-14 



-•18 



-•08 

 -10 



•00 

 -15 



+•19 



+•17 



-•01 

 -•02 



23. 



-•03 



+•05 

 +•04 

 -•02 

 +•04 

 -•24 

 -•01 

 -•03 

 +•22 

 +•20 

 +0-5 



-14 



-04 

 -•24 



+•09 



-•06 

 -•16 



-•49 

 -12 



-•44 

 -•57 



-17 



+•02 



Names of Places. 



Orkneys ... 

 Glasgow ... 

 Belfast ... 

 Armagh ... 

 Shields ... 



Cork 



Bristol ... 

 Plymouth 

 London ... 



Paris 



Christiania 



24. 



+ • 



-•03 

 -•13 



-•07 

 -•14 



-•08 

 -•08 



+•09 

 +•02 



25. 



— 04 

 +•05 

 -01 

 +•07 

 + •05 

 +•25 

 •00 

 -04 

 -01 

 -12 

 -•01 



+•08 



+•02 

 +•01 



-•02 



+•06 

 +•07 



+•14 

 + 03 



+•19 



+•20 



+•13 



-•08 



26. 



•00 

 +•06 

 +•15 

 +•12 

 +•08 

 +•20 

 +•10 

 +•10 

 +•21 

 -01 



•00 



+•07 

 +•04 

 +•08 



00 

 + 14 



+•15 

 +•16 



+•20 

 + 15 



+•21 



+•02 



Having now given a detailed explanation of the several 

 phaenomena of the preceding observations, it will be sufficient 

 to give a very general account of those of the succeeding ones ; 

 they are however of great interest. The first in occurrence, 

 whose approach is indicated by the p.m. observation of the 

 barometer at the Orkneys on the 17th, is a depression of the 

 barometer by a south wind of just sufficient strength to be 

 called a storm, and its subsequent rise; both progressing from 

 north-west to south-east. Before the restoration of the usual 

 pressure of the atmosphere a second storm occurs, prevailing 

 in Ireland on the night of the 21st, and in England on the 

 22nd ; and whilst the storm was blowing in the latter country 

 the returning current set in strong from north-west in the 

 former, raising the barometer there to a height considerably 

 above that in England (§ 16) ; its height however on the fol- 

 lowing day was rapidly reduced by the setting in again of the 

 south wind, as we have before seen in cases of a dispropor- 

 tionate elevation of the barometer in the south, and continued 

 the following day (the 24th). Both these storms, but more 

 particularly the latter, approached this island from about the 

 north of Ireland, as appears from the fall of the barometer 

 occurring first at Armagh. It must be recollected however that 

 the observation there is registered at 10 p.m., thus one hour and 



