Baromel/ic Obseivaiionss 



CRUMPSALL. 



397 



1821. A.M. 



May 14th 8". 



9 



10 



11 



12 



1 



Bar. 



Ther. 

 att. 



28.972 

 28.972 



2-^.972 

 28.9/2 

 2-'.972 

 28-970 



4G- 

 47 

 47 



47'5 



48- 



49 



Ther. 

 c!et. 



Wind. 



41'" 



435 



43-5 



45 



47 5 



4.9 



N.W. fresh. 

 iW.byN. do. 

 N.W. do. 



Weather. 



Overcast with rain. 

 C loudy with rain. 

 Do. & faint sunshine 



W.S.W. brisk. lUo. with sunshine. 



W.S.W. 

 W. bv S 



do. 

 do. 



Do. 

 iDo. 



MANCHESTER. 



1821. A.M. 

 May i4th 



SK 

 9 



10 

 11 

 12 



Bar. 



129.220 

 29.220 

 J29.-i20 

 29.220 

 29.215 



Ther. 

 att. 



54-5 



55-5 



55 



5f) 



66-5 



Ther. 

 det. 



45 

 49 



48-5 



50 



51 



Wind. 



Weather. 



X.W. by W. fresh 

 N.W. by W. do. 

 N'.VV.byW. do. 

 N.W. hyW. do. 

 N.W.bvW. do. 



Rairiy. 



Do. 



Rainy with hail. 



Do. 



Clouds & sunshine; 



If the height of the mercury in the barometer varied no more 

 between the hours of eight and twelve on the morning of the 

 14th, ii) the diftVient parts of the country where your correspon- 

 dents reside, who contiibute their monthly observiitions to your 

 Ma;?azine, than it did here and at Manchester; the observations 

 taken on that day, will form the mofit vakiable collection that has 

 yet been made, from which to estimate the relative heights of 

 their re-pective stations. 



It mav be remarked, however (and a similar remark was mada 

 by Mr. Bevan respecting his and Col. Beaufoy's observations for 

 March and April), that on comparing Mr. Hanson's observations 

 and my own for April, and those for the present month, it might 

 be supposed that an addition had been made to the quantity of 

 mercnrv in his barometer ; or that a portion had been taken from 

 that in'mine: neither of which suj^positions would be correct. 



It is worthy of notice, also, that when Mr. Hanson took the 

 twelve o'clock observation on Monday last, the mercnry in th'e 

 tube of his baro'meter had sunk l-0t)5 of an inch; whereas, my 

 barometer remained perfectly steady until one, when it fell 1-002 

 of an inch only. This is the more extraordinary, as the distance 

 between Crnnipsall and Manchester is not great, and the state 

 of tlie weather was much the same at both places. 



A well conducted course of contemporaneous observations, 

 made at a number of distant places, variously situated with re- 

 gard to each other, would prrHiably lead to a nmve accurate know- 

 ledge of the nature and operation of those causes, that occasion 

 fcuch frequent Ilucluations in the weight of the atmosphere, and, 

 consequently, in the Icngtli of the mercurial colunm by which 

 those nuetnatioMs arc measured. I am, sir, your obed. .servant. 

 To iknEdilor, John Blackw.all. 



