1822.] Mr. Moyle on the Depression of the Barometer. 449. 
1821. Barom. | Mean, | Ther. | Wind,| Strength. Weather. 
Dec, 24.— 8 a. m.| 28°465 _ 37 E_|Brisk. Fine. 
1 p. m.| 28°285 | 28°296 | 44 E_ |Brisk, Cloudy. 
10 p. m,} 27°960 — 43 N_ |Very brisk. |Heavy showers. 
Dec. 25.— 8 a. m,| 28°284 — 35 | W_  |Gentle. Cloudy. 
1 p, m.| 28-326 | 28-316 | 45 |WbyN/|Brisk. Very fine. 
10 p. m.| 28-340 — 39 W. |Brisk. Cloudy. 
Dec. 26.— 8 a. m.| 28°385 — ' 39 | NW SStrong. Heavy rain. 
lpm) — 28°455 | — | NW |Boisterous. /|Showers. 
10 p. m.| 28°555 — 42 | NW |Boisterous. |Showers. 
Dec. 27.— 8 a. m.| 28-683 — 42 | NW |Boisterous. j|Heavy showers. 
/ 1 p.m.} 28°T87T | 28786 | 46 W |Boisterous. |Showers. 
10 p. m.| 28°890 — 49 W |Very brisk. |Cloudy. 
Dec. 28.— 8 a. m.| 27°872 — 45 SE |Boisterous. |Heavy rain. 
10 a, m.| 27°830 _ — .| SE |Boisterous. |Heavy rain. 
11 a. m.| 27-620 _— 50 | SW |Boisterous. |Heavy rain. 
1 p. m.| 27652 | 27-738 | 50 |. SW |Boisterous. |Showery. 
7p. m.| 27-744 — — | SW |Boisterous. |Showery. 
11 p. m.| 27°821 _ 42 W_ |Boisterous. |Showery. 
Dec. 29.— 1 p. m.| 28°142 _ AT | NW |Boisterous. |Rain: 
Dec. 30.— 1 p. m.| 29-220 — 50 | NW |Brisk. Showery. 
Dec. 31— 1 p, m.! 30:033 _— 49 | NW |Brisk. Fine. 
On the 28th, the mercury was at the lowest level with us, 
though it appears to have been on the 25th on the Continent: 
The heights taken at 10, 11, aud 1 o’clock, were by measuring 
the column of mercury from its surface in the reservoir by an 
accurate rule, and not by the graduated plate affixed to the 
instrument; but the reservoir is so large that even this great 
fall made but 0-034 .parts of an inch difference in measuring 
it by the detached scale and the affixed. 
I should in the next place state, that my house, or rather the 
site of the barometer, is 105°30 feet above the level of the sea, 
for which elevation there ought to be an allowance of 0-104 inch 
in the height of the column of the mercury. This will reduce 
the lowest height to 27:516, for 27-620 — 0-104 = 27-516. 
This deduction should be made from all the results given by me 
for the true height. 
Iam, Sir, your obedient servant, 
M. P. Moyue. 
New Sevies, vou, 1v. 26 
