310 
MR. GLAISHER ON THE THERMOMETRICAL OBSERVATIONS 
Table I. — Showing the mean temperature of each month, as deduced from the cor-r 
rected mean of the two observations of the thermometer daily, and the corrected 
mean as found from the maximum and minimum self- registering thermometers, 
made at Somerset House during the years 1774 to 1781, and from 1787 to 1843. 
Year. 
January. 
February. 
March. 
April. 
May. 
June. 
July. 
August. 
September. 
October. 
November. 
December. 
o 
o 
o 
o 
0 
o 
o 
1774. 
33-1 
39-4 
43-9 
47-9 
52-2 
610 
62-8 
61-5 
55-8 
501 
40-5 
38-5 
1775. 
42-0 
43-3 
42-8 
50-8 
55-2 
63-5 
640 
62- 1 
59-5 
49-5 
41-5 
40-7 
1776. 
28-6 
41 -4 
44-8 
48-3 
51-7 
59-6 
63-8 
62-0 
55-6 
52-8 
44-0 
41-5 
1777. 
35-5 
37-2 
45-7 
45-1 
53-4 
572 
61-5 
63-7 
59-2 
52-6 
45-0 
37-2 
1778. 
36-4 
370 
41-2 
48-0 
55 '9 
62-2 
68-0 
64-8 
54-5 
47-3 
460 
44-2 
1779. 
36-4 
46-7 
48-1 
51-8 
55-8 
58-9 
65-9 
65-2 
61-8 
53-2 
43-2 
41-6 
1780. 
30-2 
36-7 
50-3 
44-7 
57-2 
600 
64-2 
670 
60-4 
513 
40-8 
38-0 
1781. 
37-8 
41-7 
43-7 
47-2 
54-2 
63-4 
66-3 
64-3 
1787. 
38-3 
40-9 
43-9 
45-5 
52-4 
58-7 
62-4 
62-4 
55-5 
49-9 
40-9 
41-0 
1788. 
39-0 
401 
39-7 
50-6 
57-4 
59-5 
61-6 
61-2 
570 
50-4 
41-9 
304 
1789. 
35 0 
41-3 
35-5 
45-2 
54-3 
55-7 
59-8 
61-5 
55-7 
48- 1 
40-0 
430 
1790. 
40-2 
42-6 
44-3 
420 
53-7 
57-7 
60-1 
61-2 
550 
50-8 
43-3 
40-4 
1791. 
41-4 
402 
43-2 
49-9 
50-5 
58-5 
60-5 
62-7 
57-9 
47-9 
42-6 
36-2 
1792. 
36-5 
38-8 
43-2 
50-0 
50-7 
55-3 
59-6 
63-5 
56-5 
500 
44-5 
41-4 
1793. 
36-9 
411 
40-4 
43-5 
51-8 
56-3 
65-9 
60-3 
53-9 
53-2 
44-2 
42-4 
1794. 
34-9 
461 
45-4 
50-7 
51-7 
58-5 
66-3 
60-7 
54-8 
49-6 
44-6 
38-2 
1795. 
25‘5 
35-5 
39-7 
46-2 
530 
5' f -6 
59-9 
62- 1 
61-9 
54-7 
42-0 
46-2 
1796. 
46-9 
41-0 
40-1 
49-4 
51-2 
57-0 
59-6 
61-2 
60-2 
47-8 
41-6 
31-8 
1797. 
370 
370 
390 
45-8 
52-4 
55-7 
64-3 
60-3 
55-7 
48-3 
42-7 
42-6 
1798. 
39-4 
39-3 
41-8 
50-3 
54-7 
62- 1 
62-2 
62'8 
57-6 
511 
41-3 
351 
1799. 
34-9 
37-8 
38-3 
42'6 
506 
56-5 
60-8 
58-8 
55-4 
48-6 
44-2 
34-2 
1800. 
38-5 
35-5 
38-6 
49-5 
551 
560 
64-2 
65 0 
59-0 
49-2 
43-5 
39-6 
1801. 
411 
39-9 
45-2 
46-5 
54-7 
59-3 
61-5 
63-8 
59-8 
52-2 
41-5 
37-5 
1802. 
34-5 
40-3 
42-3 
49-6 
51-3 
58-5 
57-5 
66’ 1 
58-1 
45-8 
41-8 
392 
1803. 
35 0 
37-7 
43-4 
48-9 
51-2 
571 
64-7 
630 
53-5 
502 
43-2 
44-7 
1804. 
44-8 
38-3 
42-2 
44-8 
57-7 
62-2 
61-2 
61 2 
605 
52 7 
45-4 
370 
1805. 
36- 1 
40-1 
43-1 
464 
50-7 
55-4 
60-1 
630 
60-4 
48-7 
41-2 
40-9 
1806. 
42-2 
42-9 
41-8 
44-1 
56-1 
60-7 
62-2 
62-7 
58-1 
52-5 
48-7 
48-2 
1807. 
38-3 
41-4 
38-1 
46-5 
56'1 
58-6 
64-5 
65-0 
54-2 
54-3 
40-0 
38-0 
1808. 
38-6 
37-7 
38-2 
436 
58-2 
58-9 
66-7 
63-8 
56-4 
47-4 
45-2 
37-4 
1809. 
320 
45-5 
43-7 
42-2 
56-8 
58-4 
60'6 
60-2 
57-2 
50-9 
40-8 
42-4 
1810. 
360 
400 
43-3 
47-5 
50-8 
59-4 
61-9 
61-8 
60-5 
531 
441 
400 
1811. 
34-3 
41-3 
440 
490 
564 
58-0 
61-0 
58-9 
58-3 
56-3 
46-3 
39-8 
1812. 
37'5 
430 
39 5 
42 6 
52-3 
54-9 
58-4 
58'3 
57-0 
501 
41-9 
36-5 
1813. 
360 
43-0 
44-2 
44-9 
53-4 
56-2 
59-9 
59-6 
55-6 
48-6 
415 
38-0 
1814. 
28-5 
35-4 
36-2 
49-2 
49-7 
54-3 
62- 1 
59-9 
560 
48-6 
42-0 
42-5 
1815. 
33-5 
42-6 
46- 1 
47-7 
55-8 
58-9 
60-9 
61-7 
63-4 
52-7 
40-2 
38-4 
1816. 
38-3 
38-0 
40-3 
44-5 
49-9 
540 
55-5 
59-2 
60-0 
52- 1 
40-6 
39-2 
1817. 
40-8 
440 
42-7 
45 0 
490 
600 
58-7 
56-7 
56-6 
46-3 
48-2 
38-5 
1818. 
40-9 
37-2 
420 
46-7 
53'6 
63-8 
67-2 
64-9 
61-8 
55-0 
50-5 
40-2 
1819. 
41-7 
41-4 
45-1 
49-3 
55-3 
57-3 
62-7 
65- 1 
59-2 
48-8 
42-1 
38-4 
1820. 
33-3 
38-3 
42-4 
50-4 
531 
57-0 
60-5 
59-8 
555 
48-3 
42-7 
41-3 
1821. 
391 
37-4 
43-9 
51-5 
50-5 
55-0 
58-7 
630 
60-7 
51'6 
48-9 
45-7 
1822. 
41-4 
44-7 
48-4 
47-8 
56-9 
63-5 
63-5 
62-6 
57-1 
53-3 
49-5 
37-8 
1823. 
33-4 
39-5 
40-9 
439 
55-7 
56-3 
60- 1 
611 
56-5 
48-9 
44-3 
41-3 
1824. 
39-0 
37-6 
40-6 
44-9 
50-6 
55-9 
63-5 
61-3 
58-8 
511 
47-5 
43-2 
1825. 
400 
39-5 
39-6 
49-8 
54-7 
59-8 
66-2 
63- 1 
61-0 
521 
42-5 
420 
1826. 
33-6 
43-6 
44-3 
50- 1 
511 
63-8 
66-6 
64-7 
57-4 
53-7 
41-2 
43-2 
1827. 
35 0 
330 
44-2 
47-9 
53-8 
58-5 
64-5 
603 
58 0 
531 
42-8 
45-5 
1828. 
41-4 
41-6 
44-6 
47-6 
55-4 
60-9 
62-9 
60-3 
58-6 
51-2 
45-6 
45-9 
1829. 
33-3 
39-8 
40- 1 
44-8 
55-6 
59-9 
61-1 
59-0 
54-3 
48-8 
40-6 
36-3 
1830. 
32-3 
35-6 
46-9 
49-4 
55-8 
56-2 
64 0 
59-5 
54-6 
52-2 
45-7 
36-3 
1831. 
36-0 
42-6 
45-0 
49-2 
53-9 
60-3 
65-3 
64-6 
57-5 
56-3 
456 
43-4 
1832. 
38-9 
38-3 
41-6 
48-3 
52-6 
60- 1 
62'2 
62-3 
57-7 
52-5 
45-0 
43-8 
1833. 
361 
43-8 
38-7 
46-3 
60-5 
60-7 
62 1 
58-8 
54-6 
49-6 
44-8 
46-0 
1834. 
46-0 
41-6 
45- 1 
46-1 
530 
62-0 
651 
63-6 
59-4 
51-8 
45-4 
42-4 
1835. 
39-6 
42-6 
42 1 
47-5 
540 
60-9 
65-4 
64-6 
58-2 
49-3 
44-3 
36-3 
1836. 
38-8 
38-3 
44-8 
44-4 
53-9 
59-9 
63-9 
60-2 
54-5 
48-7 
42-8 
410 
1837. 
38'8 
41-7 
36-9 
40-2 
48-9 
590 
623 
61-4 
561 
51-9 
42-4 
42-6 
1838. 
30'5 
34-3 
42 6 
42-7 
51-8 
58-1 
61-5 
60-9 
55-5 
51-3 
42-1 
400 
1839. 
38-8 
40-5 
401 
420 
510 
59-6 
61-2 
60-2 
56-7 
50-2 
460 
41 0 
1840. 
40-6 
39-5 
38-7 
48-9 
54-6 
55-2 
590 
63-4 
55-2 
48-1 
44-7 
34-7 
1841. 
36-1 
36-6 
47-9 
47-4 
57-9 
57-2 
590 
61-3 
58-5 
50-7 
44-5 
420 
1842. 
34-8 
42-2 
45-4 
45-7 
54-3 
64-2 
61-5 
66-6 
57-5 
47-2 
44-2 
45 3 
1843. 
41-3 
37-5 
43-6 
48-6 
52-8 
56-4 
By taking the means of the numbers in this table in different groups of years the 
next Table is formed. 
