C 26 ] 
1817. 
Thermometer 
without. 
Thermometer 
within. 
Barometer. 
* 
Rain,+ 
Greatest 
height. 
Least 
height. 
Mean 
height. 
Greatest 
height. 
Least i 
height 
| Mean 
height. 
Greatest 
height. 
Least 
height. 
Mean 
height. 
Deg. 
Deg. 
Deg. 
Deg. 
Deg. 
Deg. 
Inches. 
Inches. 
Inches. 
Inches. 
January 
53 
28 
4 M 
57 
37 
49, J 
30,61 
28,80 
29,66 
2,154 
February 
53 
37 
45 » 2 
60 
49 
53,7 
3°,53 
29,47 
29,94 
0,875 
March 
55 
3 ° 
43>8 
61 
47 
53,8 
30,50 
28,87 
29.84 
1,057 
April 
59 
34 
47 ,° 
64 
48 
55,9 
3 °, 5 6 
2 9,75 
30,22 
0,120 
May 
65 
42 
51,6 
64 
54 
58,0 
30,29 
29,23 
29,74 
1,698 
June 
81 
47 
62,8 
77 
55 
6 4,7 
3 °, 3 2 
29,38 
29,85 
1,860 
July 
70 
54 
60,8 
68 
57 
62,9 
30,04 
29,17 
29,81 
■i, 4 “ 
August 
68 
5 ° 
57,8 
69 
60 
64,1 
30,08 
29,00 
29,72 
1,458 
September 
69 
5 ° 
57,3 
69 
53 
60,8 
3°,'9 
29,22 
29,94 
0,300 
October 
59 
39 
48,0 
65 
47 
52,1 
30,30 
29,08 
29,89 
o ,553 
November 
57 
37 
49,2 
63 
49 
5 6 ,7 
30,50 
29,33 
30,04 
1,110 
December 
54 
27 
39 >° 
60 
40 
50,7 
30,16 
28,62 
29,61 
2,703 
Whole year 
5 °, 3 
5 6 ,9 
29,85 
15,299 
• The quicksilver in the bason of the barometer, is 81 feet above the level 
of low water spring tides at Somerset-house. 
f The Society’s Rain Gage is 114 feet above the same level, and 75 feet 
6 inches above the surrounding ground. 
Mean variation of the magnetic needle, June 1817, 24° 17' West. 
