THE ROYAL SOCIETY, AND AT THE ROYAL OBSERVATORY, GBEENWICH 
601 
maximum and minimum thermometers in each month during the whole time they 
Greenwich, from the year 1841 to 1849. 
July. 
August. 
September, 
October. 
November. 
December. 
Reading of the thermo- 
Reading of the thermo- 
Reading of the thermo- 
Reading of the thermo- 
Reading of the thermo- 
Reading of the thermo- 
Year. 
meters in the month. 
meters in the month. 
meters in the month. 
meters in the month. 
meters in the month. 
meters in the month. 
Lowest. 
Highest. 
Lowest. 
Highest. 
Lowest. 
Highest. 
Lowest. 
Highest. 
Lowest. 
Highest. 
Lowest. 
Highest. 
o 
O 
o 
o 
■o 
o 
o 
1794. 
54 
84 
48 
78 
37 
68 
35 
63 
30-5 
57 
25-5 
54 
1795. 
46 
76 
51 
79 
45 
78 
42 
68 
28 
56 
34 
56 
1796. 
44-5 
77-5 
48 
80 
45 
79 
30 
59 
29 
57 
4 
51 
1797. 
48 
85 
48 
76 
42 
71 
35 
63 
27 
57 
29 
56 
1798. 
51 
78 
52 
83 
44 
76 
32 
64 
25 
60 
11 
50 
1799. 
48 
77 
47 
73 
42 
72 
35 
63 
32 
58 
17 
50 
1800. 
50 
81 
49 
89 
41 
77 
35 
66 
30 
59 
29 
51 
1801. 
47 
79 
51 
79 
46 
73 
34 
66 
26 
60 
23 
52 
1802. 
45 
71 
50 
82 
40 
75 
33 
75 
30 
53 
29 
50 
1803. 
51 
86 
47 
81 
38 
75 
38 
67 
31 
57 
21 
55 
1804. 
49 
80 
49 
81 
45 
81-5 
38 
68 
34 
59 
19 
51 
1805. 
50 
79 
51 
79 
43 
79 
35 
63 
31 
55 
25 
54 
1806. 
52 
81 
51 
80 
44 
73 
35 
65 
36 
60 
39 
57 
1807. 
48 
85 
52 
80 
38 
72 
39 
68 
28 
56 
23 
51 
1808. 
50 
93-5 
51 
80 
39 
71 
35 
63 
31 
56 
19 
53 
1809. 
50 
78 
49 
79 
40 
72 
35 
65 
29 
54 
32 
54 
1810. 
51 
78 
50 
80 
48 
83 
30 
68 
1820. 
50 
80 
46 
77 
38 
73 
39 
65 
31 
56 
25 
57 
1821. 
46 
74 
50 
77 
46 
75 
41 
68 
34 
63 
36 
58 
1822. 
53 
76 
50 
80 
45 
70 
41 
66 
38 
61 
23 
54 
1823. 
49 
74 
49 
78 
40 
73 
37 
62 
29 
55 
29 
53 
1824. 
51 
81 
50-5 
77 
37 
81 
31 
65 
29 
60 
31 
54 
1825. 
51 
89 
53 
84 
47 
77 
33 
68 
29 
58 
28 
535 
1826. 
55 
81-2 
43-8 
72-3 
37-6 
67-8 
26-8 
52-3 
32-2 
53 
1827. 
51-8 
811 
48-3 
80-2 
47-7 
700 
36-4 
67-7 
23-8 
55-8 
30-8 
54-8 
1828. 
46-8 
78-7 
49-8 
72-7 
44-9 
72-3 
36-5 
63-3 
25-7 
58-4 
33-8 
55-3 
1829. 
48-7 
74-7 
46-7 
76-5 
42-4 
66-7 
33-3 
61-4 
26-8 
527 
18-2 
46-0 
1830. 
48-8 
85-8 
460 
77-7 
43-8 
69-8 
35-2 
66-5 
330 
58-5 
15-8 
47-2 
1831. 
52-3 
80-8 
54-4 
79-7 
46-5 
72-2 
40-3 
68-2 
28-7 
57-2 
29-8 
55-6 
1832. 
49-6 
81-2 
470 
81-8 
41-6 
72-9 
39-4 
68-2 
36-3 
59-3 
32-3 
55-8 
1833. 
47-3 
80-5 
48-2 
75-3 
410 
67-2 
38-3 
62-3 
31-6 
59-7 
32-9 
55-6 
1834. 
51-4 
86-7 
46-2 
85-3 
46-8 
740 
34-4 
70-2 
33-2 
61-5 
29-2 
54-5 
1835. 
50-6 
84-2 
51-8 
80-6 
46-4 
76-3 
35-4 
62-6 
34-9 
55-5 
210 
51-6 
1836. 
46-2 
85-2 
48-4 
73-4 
40-7 
69-6 
300 
61-2 
31-3 
56-7 
27-4 
557 
1837. 
47-5 
79-6 
48-5 
78-8 
44-4 
69-7 
35-4 
68-5 
28’0 
56-4 
317 
55-3 
1838. 
496 
790 
46-5 
760 
42-8 
695 
32-8 
63-5 
30-0 
577 
29-8 
55-0 
1839. 
48-6 
80-3 
45-4 
78-6 
45-0 
700 
37-3 
63-5 
33-8 
55 3 
320 
54-6 
1840. 
49-4 
77-2 
524 
80-0 
417 
75-7 
35-3 
60-7 
30-3 
60-6 
21-2 
55'5 
1841. 
49-8 
80-3 
500 
77-5 
42-8 
746 
37-2 
64-3 
28-2 
58-6 
29-9 
55-8 
1842. 
50-4 
82-7 
500 
87-0 
44-4 
760 
340 
60-7 
35-6 
55 5 
347 
57-5 
At the Royal Observatory, Greenwich. 
1840. 
• •• 
23-8 
61-2 
16-4 
55-2 
1841. 
44-3 
76-0 
45-5 
79-6 
36-6 
79-6 
32-2 
64-6 
22-2 
58-3 
24-3 
53-9 
1842. 
45-5 
78-8 
47-5 
90-5 
41-1 
75-8 
28-3 
60-9 
3M 
55-9 
30-8 
58-2 
1843. 
44-6 
89-8 
47-2 
82-8 
340 
79-9 
28-5 
704 
27-4 
57-5 
25-6 
547 
1844. 
47-1 
87-4 
42-8 
75-4 
34-8 
78-0 
30-8 
67-4 
27-4 
58-1 
21-1 
49-3 
1845. 
44-6 
833 
43-2 
77-8 
33-4 
73-5 
31-4 
67-6 
29-1 
59-6 
28-0 
55-5 
1846. 
49-1 
93-3 
47-5 
920 
39-2 
86-4 
35 0 
67-7 
23-4 
61-5 
18-8 
49-9 
1847. 
45-4 
89-0 
42-0 
87-3 
320 
72-5 
330 
73-2 
24-5 
66-3 
25-0 
59-5 
1848. 
42-2 
85-3 
42-5 
75-5 
32-8 
78-8 
32-4 
740 
25-2 
57-8 
21-8 
62-8 
1849. 
470 
84-1 
42-4 
82-5 
42-7 
790 
31-5 
69-7 
23-5 
617 1 
18-8 
56-3 
will be seen that the minimum temperatures at the Observatory are usually some de- 
reading at the Observatory was as low as 4°, whilst that at Somerset House was 14°‘9 ; 
the Thames, and this difference is always shown at those low temperatures between 
at the Observatory are usually the higher, but not always so; the maximum in June 
4 H 
MDCCCL, 
