72 Barometric Observations. 
Ther. | Ther. 
attach: detach: Wind moderate. 
1891. Barom. 
Dec. 10. 8} 29-308 | 51-5 | 51° [s.w. blowing down an inclined 
9 | 29-314 | 59- 5)-5 plane from the house. s 
16 | 29-300 | 52: 52: |S. blowing freely to and past ( 2 
1] ; 29-278 |} 63: 53° the house. — Oo 
1822. ie 
Jan. 14. 8 | 29:750 | 46:5 | 40: |S.W. blowing, &c. rather } £5 
9 | 29:772 | 52:5 | 4l- Do. [strong. | E> 
10 | 29-780 | 54: 42: Do. = 2 
ll | 29-788 | 545 | 42° Iw. Do. f wo 
12 | 29:772 } 59:5 | 42-5 Do. ' ‘5 4 
1 | 29-770 | 55 | 43: Do. Jes 
Sir, Hafod, near Mold, Flintshire, Jan. 16, 1822. 
The above are the heights of my Barometer at the specified 
times. But | beg leave to observe, that neither these nor my obser- 
vations in February last were corrected by the fraction marked 
on the Barometer, namely, ;!;, for I conceive that the differ- 
ence is too minute to be regarded until the general operation of 
the instrument is found to be less varied with reference to the 
desired object. leh. 
It will be seen that there is a very material difference in the 
comparative heights of my Barometer, and those of your other 
correspondents in February and December. In the former month 
the prevailing wind (which was very moderate) came up the Vale 
of Mold almost directly against the front of my house, which is 
sheltered by a plantation of 27 years growth, and of considerable 
extent, on a hill at a short distance behind it; and at that time 
the average height of the mercury in my Barometer appears to 
have been very nearly the same as in that of Col. Beaufoy at 
Bushey Park. Whereas in December, with the wind from an 
opposite quarter, mine appears to have been lower by -245, though 
with a higher temperature. 
Is it possible that from this cause the atmosphere here in Fe- 
bruary may have been locally condensed? Allow me to throw 
out this hint, as I conceive that experiments might be made to 
ascertain whether this is the case under such circumstances, but 
which I have not leisure at present to attempt. At any rate, it ap- 
pears to me to be desirable that each communication should be 
accompanied by a statement of the situation of the instrument 
with reference to the adjacent country or buildings, &¢. as op- 
posed or otlierwise-to the prevailing winds at the times of obser- 
vation. 
I am, sir, 
Your most obedient servant, 
Wm. Warp. 
Pia. 
a 
