Colonel Beaufoy on the Variation qf the Needle. 191 
ANNUAL METEOROLOGICAL TABLE of the Mean Height of the Barometer, &c. 
Year. 
Barome- 
ter. 
Barome- 
ter. 
Barome- 
ter. 
Thermo- 
meter. 
Thermo- 
meter. 
Thermo- 
meter. 
Hygro- 
meter. 
Hygro- 
meter. 
1 Hygro- 
1 ' meter. 
Winds, 
Rain. 
Evapora- 
j tion. 
1 Mean 
1 Heat*,. 
1818, 
Inch. 
29.208 
Inch. 
29.421 
Inch, 
29.482 
48°.7 
.54!3 
56!3 
59!2 
O 
51.3 
44^6 
SW 
Inch. 
Inch, 
50.0 
1819, 
29.389 
29.407 
29.464 
48.1 
53.5 
56.3 
68.4 
55.8 
53.5 
SW 
2.6415 
35.150 
49.3 
TABLE, containing the Morning, Noon, and Evening Mean Annual Variation 
of the Magnetic Needle, during the Years 1818 and 1819. 
o ! // 
o i if 
( Morning, ] 
1 24 34 38 
f Morning, 
24 33 06 
1818, 4 Noon, 
l24 43 26 
1819, 4 Noon, 
24 40 53 
{ Evening, J 
1 24 37 10 
(_ Evening, 
24 34 43 
TABLE, containing the Mean Monthly Diurnal Variation of the Magnetic 
Needle, between Morning and Noon, and Noon and Evening, for Three 
Years and Nine Months. 
Months, 
Years 
1817, 1618. 
Years 
1818, 1819. 
Years 
1819, 1820. 
Years 
1819, 1820. 
Mean. 
1817, 
April, 4 
' Morning, 
1 f 
/ // 
12 51 
8 45 
/ o 
10 44 
8 14 
/ // 
10 33 
8 10 
/ // 
9 31 
8 31 
/ // 
11 00 
8 25 
( 
[Evening , } 
May, j 
[ Morning, 1 
Noon, 1 
Evening, j 
10 15 
7 50 
9 31 
7 14 
8 40 
7 12 
9 26 
7 08 
9 28 
7 21 
June,-| 
1 Morning, 
Noon, V 
[ Evening, ) 
11 05 
7 29 
11 24 
7 31 
10 13 
6 32 
9 26 
5 28 
10 32 
6 45 
July, j 
Morning, 
' Noon, 1 
[ Evening, j 
10 52 
6 23 
10 35 
6 45 
9 41 
6 35 
10 19 
5 34 
10 22 
6 19 
Aug. j 
[ Morning, ^ 
' Noon, 1 
[Evening, ) 
11 35 
11 18 
10 16 
9 35 
10 41 
9 06 
8 08 
8 25 
6 46 
8 06 
Sept, j 
r Morning, \ 
Noon, 1 
[Evening, j 
8 34 
10 53 
9 06 
9 13 
9 27 
6 58 
7 54 
8 06 
7 30 
7 37 
Oct. -j 
[ Morning, ) 
[ Noon, ) 
9 40 
7 52 
6 41 
8 38 
8 11 
Nov, -! 
[ Morning, 1 
[ Noon, j 
6 06 
8 17 
6 01 
5 15 
6 25 
Dec. -j 
[ Morning, 1 
[ Noon, j 
3 59 
4 16 
3 51 
1818, ( 
Jan. 1 
[ Morning, 1 
1 Noon, j 
5 55 
4 12 
. 3 48 
4 28 
Feb. -1 
1 Morning, 1 
^ Noon, ( 
6 29 
5 38 
5 48 
5 59 
Mar, j 
r Morning, i 
Noon, > 
8 19 
8 24 
8 46 
8 30 
[Evening, ) 
7 50 
6 25 
5 48 
6 41 
Bushey Heath, Stanmore, ) 
Qth December 1820. j 
