345 



In the following observations, the lower station was the 

 N. W. coping-stone of the Barrow lock-gate in the town of 

 Carlow; the upper station, the summit of Clogrenan Hill. 

 Diff. of level by Ordnance Map = 157-00 fath. 



Table I. 



i 



c 



'~* 

 6 



Lower Station. 



Upper Station. 



Therm. 

 Coeff. 



Hygrom. 

 Coeffi 



P+P' 

 P+P'-f-f 



Observations. 



P 



/ 



l 



P' 



/' 



( 



i+4 



493 



1 



in. 

 29654 



in. 

 0-260 



50° 



28-646 



0-258 



4 o 



1034 



1-008 



Oct. 2, 1849; fine 



day. 

 Oct. 3, 1849; wet, 



cloudy day. 

 Oct. 4, 1849; fine 



day- 

 October 5, 1849; 



heavy rain. 

 Oct. 8, 1849 ; fine 



day. 

 Oct. 9, 1849; fine 



day. 

 October 10, 1849; 



fine, cloudy. 

 October 12, 1849; 



high wind, fine. 

 October 19, 1849; 



wet and cloudy. 

 October 20, 1849; 



fine; high wind. 



2 



29-071 



0-320 



48 



28-054 



0-298 



45 



1-029 



1-011 



3 



29-362 



0-234 



50 



28-355 



0-222 



44 



1-033 



1008 



4 

 5 



29-555 

 29-880 



0-271 

 0-252 



47 

 49 



28-518 



28-852 



0-263 

 0-203 



42 

 45 



1025 

 1030 



1009 

 1-008 



6 



29-934 



0-238 



49 



28-900 



0-249 



45 



1030 



1-008 



7 



S 



9 



10 



29-687 

 29-651 

 29-591 

 29-609 



0-281 

 0-214 

 0-430 

 0-319 



49 

 51 



59 

 55 



28-665 

 28-620 

 28-581 

 28610 



0-249 

 0-217 

 0-420 

 0-308 



45 

 46 

 54 

 49 



1-030 

 1-033 

 1-050 

 1040 



1-007 

 1-007 

 1.015 | 

 1-011 



In observations 9 and 10, the lower station was at a point 

 situated 15-06 feet above the lower station of the first eight 

 observations. The barometer employed was made by Mr. 

 Newman, of Regent-street. An observation of this barometer 

 was made on setting out and returning from the Hill, and the 

 exact height, at the time of the observation at the upper sta- 

 tion, was found by interpolation, with the aid of observations 

 of a good barometer, recorded by another observer, within a 

 few yards of the lower station. In observations 9 and 10, the 

 observation at the lower station was made simultaneously with 

 a second barometer of Mr. Newman's construction. 



In the following Table, I have calculated the heights from 



