HOURLY OBSERVATIONS OF AIR TEMPERATURE AND PRESSURE. 
641 
Table B (continued).—Values of the x4mplitude P, and the Apparent Time of the 
First Maximum [i, for the First Four Orders of Harmonic Components of the 
Diurnal Inequality of Temperature at Greenwich for each Month of the Year, 
for Five-Yearly Periods between 1849 and 1868. 
Five- 
yearly 
periods. 
January. 
February. 
March. 
April. 
May. 
June. 
July. 
August. 
September. 
October. 
S 
rO 
s 
O) 
> 
o 
December. 
Tear. 
1st . . 
222° 
217° 
214° 
212° 
211° 
208° 
208° 
213° 
211° 
212° 
218° 
223° 
214° 
2ud . * . 
216 
216 
217 
212 
210 
211 
211 
213 
212 
212 
220 
226 
215 
3rd . . 
213 
216 
214 
214 
212 
209 
211 
212 
210 
213 
218 
217 
213 
/'l 
4tli 
217 
220 
215 
113 
210 
211 
212 
213 
211 
216 
218 
222 
215 
Mean . . 
217 
217« 
215 
213 
211 
210 
210 
213 
211 
213 
219 
222 
214 
1st 
22 
21 
18 
9 
9 
- 8 
0 
16 
19 
19 
22 
18 
14 
2nd 
19 
17 
17 
14 
6 
6 
8 
15 
15 
18 
20 
20 
14 
3rd . . 
23 
19 
22 
12 
17 
9 
11 
17 
13 
18 
20 
23 
17 
-"2 
4tli . . 
20 
20 
16 
17 
— 2 
- 1 
13 
14 
16 
17 
21 
20 
14 
Mean . 
21 
19 
18 
13 
8 
1 
8 
16 
16 
18 
21 
20 
15 
1st . . 
75 
69 
40 
14 
14 
16 
12 
15 
21 
66 
75 
76 
41 
2nd . . 
74 
70 
30 
19 
14 
12 
12 
18 
36 
68 
73 
73 
41 
3rd . . 
73 
69 
40 
15 
11 
13 
10 
13 
23 
68 
72 
72 
40 
-“3 
4tli . . 
72 
66 
49 
22 
13 
12 
11 
16 
26 
62 
70 
77 
41 
Mean . 
74 
69 
40 
18 
13 
13 
11 
16 
27 
66 
73 
74 
41 
1st . . 
12 
56 
58 
47 
25 
16 
23 
46 
58 
62 
25 
12 
58 
2nd . . 
14 
57 
57 
55 
27 
20 
30 
47 
60 
62 
16 
14 
60 
3rd . . 
10 
65 
56 
48 
16 
17 
24 
38 
57 
51 
- 8 
0 
53 
4tE . . 
5 
68 
61 
61 
24 
11 
7 
46 
57 
62 
9 
15 
57 
Mean . . 
10 
62 
58 
53 
23 
16 
21 
44 
58 
59 
11 
10 
57 
Time of t 
sunrise J 
118° 
106° 
91° 
77° 
66° 
58° 
61° 
72° 
87° 
101° 
115° 
122-' 
— 
4 N 
MDCCCXCIII.—A, 
