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



however, one degree of Fahrenheit affects the barometer at 

 30 inches only *003 inch, and there is seldom a greater dif- 

 ference than 3° between the temperatures of consecutive ob- 

 servations, it will not affect any of the conclusions which may 

 be deducible from them. The numbers representing the 

 heights at Christiania in Paris lines, and at Paris in millime- 

 tres, have been reduced to English inches. 



Names of 

 places. 



Hours of observation. 



Mean of 



the 

 month. 



Orkneys .. 

 Glasgow*. . 



Belfast 



Armaghf.. 



Shields 



Cork 



Bristol 



Plymouth... 

 London ... 



Paris 



Christiania . 



9% a.m. & 8£ p.m. 

 9 a.m. & p.m. 



9 a.m. & 3 p.m. 



10 a.m. & p.m. 



9 a.m. & 2 & 9| p.m. 

 9 a.m. & 3 p.m. 

 9£ a.m. & p.m. 

 9 a.m. & p.m. 

 9 a.m & 3 p.m. 

 9 a.m. & 3 & 9 p.m. 

 9 a.m. & 10 p.m. 



29-70 

 29-53 

 2974 

 29-44 

 29-68 

 2974 

 29-70 

 2971 

 2972 

 2961 

 2971 



3010 

 30-07 

 3035 



30-14 

 30-22 

 30-22 

 30-27 

 30-23 

 3008 

 29-61 



30-33 



3017 

 3015 



3017 



30-22 

 3008 



29-97 

 30-21 



3014 

 3016 



3000 

 29-96 



30-24 

 3007 

 30-24 

 29-91 

 30-21 

 29-98 

 3009 

 30 09 

 3014 

 29-90 

 30-03 



3018 



30-19 

 29-92 



3010 



30-22 

 3001 



29-82 

 3016 



30-01 

 3000 



29-83 

 30-20 



Orkneys .. 

 Glasgow .. 



Belfast 



Armagh .. 



Shields 



Cork 



Bristol 



Plymouth. . 

 London .. 



Paris 



Christiania 



3. 



30-20 

 3000 

 3016 

 29-86 

 30-10 

 29-83 

 29-94 

 29-88 

 3000 

 29-76 

 3027 



30-18 



30-10 

 29-83 



2996 



30-28 

 3008 



29-97 

 3015 



2998 

 29-95 



29-69 

 30-36 



30-44 

 30-21 

 30-38 

 30-12 

 30-25 

 3016 

 30-07 

 3009 

 3006 

 29-75 

 30-42 



30-45 



30-34 

 3016 



30-13 



30-54 

 30-34 



30-23 

 30-40 



30-21 

 30-21 



29-86 

 30-32 



30-53 

 30-37 

 30-57 

 30-30 

 30-39 

 30-33 

 30-23 

 30-26 

 3019 

 2975 

 30-28 



30-55 



30-33 

 30-32 



30-12 



30-51 

 30-28 



30-23 

 30-34 



3016 

 3019 



2975 

 30-27 



* These observations give a mean much below the general one, which 

 is probably the defect of the scale. I have compared them, however, with 

 those given in the tables of the Philosophical Magazine for Applegarth 

 Manse in Dumfries-shire, a locality not far distant, with which their varia- 

 tions agree, with the exception of being a little in advance in movements 

 coming from north, for which reason I have given them the preference 

 here. I may add also, that the observations at Belfast were received with 

 the information that they might be rather defective, which however is of 

 little consequence, as those at Armagh are given. I have inserted the 

 former, because of those at 3 p.m. 



f Height of the barometer 21 1 feet above the level of the sea. 



