Table I.—Temperature of the Dew-Point, in Degrees Fahrenheit.
| t |
Difference between the dry and wet thermometers (t-t′). |
t |
| (Dry ther.) |
24°.0 |
25°.0 |
26°.0 |
27°.0 |
28°.0 |
29°.0 |
30°.0 |
31°.0 |
32°.0 |
33°.0 |
34°.0 |
35°.0 |
36°.0 |
(Dry ther.) |
| 80 |
32 |
29 |
25 |
21 |
15 |
8 |
-3 |
-27 |
|
|
|
|
|
80 |
| 81 |
35 |
31 |
28 |
24 |
18 |
12 |
+3 |
-11 |
|
|
|
|
|
81 |
| 82 |
37 |
33 |
30 |
26 |
22 |
16 |
9 |
-2 |
-24 |
|
|
|
|
82 |
| 83 |
39 |
35 |
32 |
28 |
24 |
19 |
13 |
+5 |
-9 |
|
|
|
|
83 |
| 84 |
41 |
37 |
34 |
30 |
27 |
22 |
17 |
10 |
0 |
-20 |
|
|
|
84 |
| 85 |
42 |
39 |
36 |
32 |
29 |
25 |
20 |
14 |
+6 |
-7 |
-54 |
|
|
85 |
| 86 |
44 |
41 |
38 |
35 |
31 |
28 |
23 |
18 |
11 |
+1 |
-17 |
|
|
86 |
| 87 |
46 |
43 |
40 |
37 |
33 |
30 |
26 |
21 |
15 |
7 |
-5 |
-38 |
|
87 |
| 88 |
48 |
45 |
42 |
39 |
35 |
32 |
28 |
24 |
19 |
12 |
+3 |
-13 |
|
88 |
| 89 |
49 |
47 |
44 |
41 |
38 |
34 |
31 |
27 |
22 |
16 |
9 |
-2 |
-28 |
89 |
| 90 |
51 |
48 |
46 |
43 |
40 |
36 |
32 |
29 |
25 |
20 |
13 |
+4 |
-10 |
90 |
| 91 |
53 |
50 |
47 |
45 |
42 |
38 |
35 |
32 |
28 |
23 |
18 |
10 |
0 |
91 |
| 92 |
54 |
52 |
49 |
46 |
44 |
41 |
37 |
34 |
30 |
26 |
21 |
15 |
+7 |
92 |
| 93 |
56 |
53 |
51 |
48 |
46 |
43 |
39 |
36 |
32 |
29 |
24 |
19 |
12 |
93 |
| 94 |
57 |
55 |
53 |
50 |
47 |
45 |
42 |
38 |
35 |
31 |
27 |
22 |
16 |
94 |
| 95 |
59 |
56 |
54 |
52 |
49 |
46 |
44 |
40 |
37 |
33 |
30 |
25 |
20 |
95 |
| 96 |
60 |
58 |
56 |
53 |
51 |
48 |
46 |
43 |
39 |
36 |
32 |
28 |
24 |
96 |
| 97 |
61 |
59 |
57 |
55 |
53 |
50 |
47 |
45 |
41 |
38 |
34 |
31 |
26 |
97 |
| 98 |
63 |
61 |
59 |
57 |
54 |
52 |
49 |
47 |
44 |
40 |
37 |
33 |
29 |
98 |
| 99 |
64 |
62 |
60 |
58 |
56 |
54 |
51 |
48 |
46 |
43 |
39 |
35 |
32 |
99 |
| 100 |
66 |
64 |
62 |
60 |
57 |
55 |
53 |
50 |
48 |
45 |
41 |
38 |
34 |
100 |
| 101 |
67 |
65 |
63 |
61 |
59 |
57 |
54 |
52 |
49 |
47 |
44 |
40 |
37 |
101 |
| 102 |
68 |
66 |
65 |
63 |
61 |
58 |
56 |
54 |
51 |
49 |
46 |
43 |
39 |
102 |
| 103 |
70 |
68 |
66 |
64 |
62 |
60 |
58 |
55 |
53 |
50 |
48 |
45 |
41 |
103 |
| 104 |
71 |
69 |
67 |
65 |
63 |
61 |
59 |
57 |
55 |
52 |
50 |
47 |
44 |
104 |
| 105 |
72 |
70 |
69 |
67 |
65 |
63 |
61 |
59 |
56 |
54 |
52 |
49 |
46 |
105 |
| 106 |
74 |
72 |
70 |
68 |
66 |
64 |
62 |
60 |
58 |
56 |
53 |
51 |
48 |
106 |
| 107 |
75 |
73 |
71 |
70 |
68 |
66 |
64 |
62 |
60 |
57 |
55 |
52 |
50 |
107 |
| 108 |
76 |
74 |
73 |
71 |
69 |
67 |
65 |
63 |
61 |
59 |
57 |
54 |
52 |
108 |
| 109 |
77 |
76 |
74 |
72 |
71 |
69 |
67 |
65 |
63 |
61 |
58 |
56 |
54 |
109 |
| 110 |
79 |
77 |
75 |
74 |
72 |
70 |
68 |
66 |
64 |
62 |
60 |
58 |
55 |
110 |
| t. |
24°.0 |
25°.0 |
26°.0 |
27°.0 |
28°.0 |
29°.0 |
30°.0 |
31°.0 |
32°.0 |
33°.0 |
34°.0 |
35°.0 |
36°.0 |
t. |
Table I.—Temperature of the Dew-Point, in Degrees Fahrenheit.
| t |
Difference between the dry and wet thermometers (t-t′). |
t |
| (Dry ther.) |
36°.0 |
37°.0 |
38°.0 |
39°.0 |
40°.0 |
41°.0 |
42°.0 |
43°.0 |
44°.0 |
45°.0 |
46°.0 |
47°.0 |
48°.0 |
(Dry ther.) |
| 89 |
-28 |
|
|
|
|
|
|
|
|
|
|
|
|
89 |
| 90 |
-10 |
|
|
|
|
|
|
|
|
|
|
|
|
90 |
| 91 |
0 |
-22 |
|
|
|
|
|
|
|
|
|
|
|
91 |
| 92 |
+7 |
-7 |
-16 |
|
|
|
|
|
|
|
|
|
|
92 |
| 93 |
12 |
+2 |
-4 |
|
|
|
|
|
|
|
|
|
|
93 |
| 94 |
16 |
8 |
+4 |
-37 |
|
|
|
|
|
|
|
|
|
94 |
| 95 |
20 |
13 |
10 |
-12 |
|
|
|
|
|
|
|
|
|
95 |
| 96 |
24 |
15 |
15 |
-1 |
-25 |
|
|
|
|
|
|
|
|
96 |
| 97 |
26 |
21 |
19 |
+7 |
-8 |
|
|
|
|
|
|
|
|
97 |
| 98 |
29 |
25 |
23 |
12 |
+2 |
-18 |
|
|
|
|
|
|
|
98 |
| 99 |
32 |
28 |
26 |
17 |
9 |
-4 |
-42 |
|
|
|
|
|
|
99 |
| 100 |
34 |
30 |
29 |
21 |
14 |
+5 |
-12 |
|
|
|
|
|
|
100 |
| 101 |
37 |
32 |
32 |
24 |
18 |
11 |
0 |
-25 |
|
|
|
|
|
101 |
| 102 |
39 |
35 |
34 |
27 |
22 |
16 |
+7 |
-7 |
|
|
|
|
|
102 |
| 103 |
41 |
38 |
34 |
30 |
26 |
20 |
13 |
+3 |
-16 |
|
|
|
|
103 |
| 104 |
44 |
40 |
37 |
32 |
29 |
24 |
18 |
10 |
-2 |
-38 |
|
|
|
104 |
| 105 |
46 |
43 |
39 |
35 |
31 |
27 |
22 |
15 |
+6 |
-10 |
|
|
|
105 |
| 106 |
48 |
45 |
42 |
38 |
34 |
30 |
25 |
20 |
12 |
+1 |
-22 |
|
|
106 |
| 107 |
50 |
47 |
44 |
40 |
37 |
32 |
28 |
24 |
17 |
9 |
-5 |
|
|
107 |
| 108 |
52 |
49 |
46 |
43 |
39 |
35 |
31 |
27 |
21 |
14 |
+5 |
-13 |
|
108 |
| 109 |
54 |
51 |
48 |
45 |
42 |
38 |
34 |
30 |
25 |
19 |
12 |
0 |
-28 |
109 |
| 110 |
55 |
53 |
50 |
47 |
44 |
41 |
37 |
33 |
28 |
23 |
17 |
+8 |
-7 |
110 |
| t. |
36°.0 |
37°.0 |
38°.0 |
39°.0 |
40°.0 |
41°.0 |
42°.0 |
43°.0 |
44°.0 |
45°.0 |
46°.0 |
47°.0 |
48°.0 |
t. |
Table II.—Relative Humidity, per cent.
| t |
Difference between the dry and wet thermometers (t—t′). |
t |
| (Dry ther.) |
0°.2 |
0°.4 |
0°.6 |
0°.8 |
1°.0 |
1°.2 |
1°.4 |
1°.6 |
1°.8 |
2°.0 |
2°.2 |
2°.4 |
2°.6 |
(Dry ther.) |
| -40 |
46 |
|
|
|
|
|
|
|
|
|
|
|
|
-40 |
| -39 |
49 |
|
|
|
|
|
|
|
|
|
|
|
|
-39 |
| -38 |
51 |
|
|
|
|
|
|
|
|
|
|
|
|
-38 |
| -37 |
54 |
|
|
|
|
|
|
|
|
|
|
|
|
-37 |
| -36 |
56 |
|
|
|
|
|
|
|
|
|
|
|
|
-36 |
| -35 |
59 |
|
|
|
|
|
|
|
|
|
|
|
|
-35 |
| -34 |
61 |
22 |
|
|
|
|
|
|
|
|
|
|
|
-34 |
| -33 |
63 |
25 |
|
|
|
|
|
|
|
|
|
|
|
-33 |
| -32 |
65 |
30 |
|
|
|
|
|
|
|
|
|
|
|
-32 |
| -31 |
67 |
34 |
|
|
|
|
|
|
|
|
|
|
|
-31 |
| -30 |
69 |
38 |
|
|
|
|
|
|
|
|
|
|
|
-30 |
| -29 |
71 |
42 |
|
|
|
|
|
|
|
|
|
|
|
-29 |
| -28 |
72 |
45 |
17 |
|
|
|
|
|
|
|
|
|
|
-28 |
| -27 |
74 |
48 |
22 |
|
|
|
|
|
|
|
|
|
|
-27 |
| -26 |
76 |
51 |
26 |
|
|
|
|
|
|
|
|
|
|
-26 |
| -25 |
77 |
53 |
31 |
|
|
|
|
|
|
|
|
|
|
-25 |
| -24 |
78 |
56 |
34 |
12 |
|
|
|
|
|
|
|
|
|
-24 |
| -23 |
79 |
58 |
37 |
16 |
|
|
|
|
|
|
|
|
|
-23 |
| -22 |
80 |
60 |
40 |
20 |
|
|
|
|
|
|
|
|
|
-22 |
| -21 |
81 |
62 |
44 |
25 |
|
|
|
|
|
|
|
|
|
-21 |
| -20 |
82 |
64 |
47 |
29 |
11 |
|
|
|
|
|
|
|
|
-20 |
| -19 |
83 |
66 |
49 |
33 |
16 |
|
|
|
|
|
|
|
|
-19 |
| -18 |
84 |
68 |
52 |
36 |
20 |
|
|
|
|
|
|
|
|
-18 |
| -17 |
85 |
70 |
54 |
39 |
24 |
9 |
|
|
|
|
|
|
|
-17 |
| -16 |
86 |
71 |
57 |
43 |
28 |
14 |
|
|
|
|
|
|
|
-16 |
| -15 |
86 |
73 |
59 |
46 |
32 |
19 |
|
|
|
|
|
|
|
-15 |
| -14 |
87 |
74 |
61 |
48 |
36 |
23 |
10 |
|
|
|
|
|
|
-14 |
| -13 |
88 |
76 |
63 |
51 |
39 |
27 |
15 |
|
|
|
|
|
|
-13 |
| -12 |
88 |
77 |
65 |
53 |
42 |
30 |
19 |
7 |
|
|
|
|
|
-12 |
| -11 |
89 |
78 |
67 |
56 |
45 |
34 |
23 |
12 |
|
|
|
|
|
-11 |
| -10 |
90 |
79 |
68 |
58 |
48 |
37 |
26 |
16 |
5 |
|
|
|
|
-10 |
| -9 |
90 |
80 |
70 |
60 |
50 |
40 |
30 |
20 |
10 |
|
|
|
|
-9 |
| -8 |
90 |
81 |
71 |
62 |
52 |
43 |
33 |
24 |
14 |
5 |
|
|
|
-8 |
| -7 |
91 |
82 |
73 |
63 |
54 |
45 |
36 |
27 |
18 |
9 |
|
|
|
-7 |
| -6 |
91 |
83 |
74 |
65 |
56 |
48 |
39 |
31 |
22 |
13 |
5 |
|
|
-6 |
| -5 |
92 |
83 |
75 |
67 |
58 |
50 |
42 |
34 |
25 |
17 |
9 |
|
|
-5 |
| -4 |
92 |
84 |
76 |
68 |
60 |
52 |
45 |
37 |
29 |
21 |
13 |
5 |
|
-4 |
| -3 |
92 |
85 |
77 |
70 |
62 |
55 |
47 |
40 |
32 |
25 |
17 |
10 |
|
-3 |
| -2 |
93 |
86 |
78 |
71 |
64 |
57 |
50 |
42 |
35 |
28 |
21 |
14 |
7 |
-2 |
| -1 |
93 |
86 |
79 |
72 |
66 |
59 |
52 |
45 |
38 |
31 |
25 |
18 |
11 |
-1 |
| 0 |
93 |
87 |
80 |
74 |
67 |
61 |
54 |
48 |
41 |
35 |
28 |
22 |
15 |
0 |
| +1 |
94 |
87 |
81 |
75 |
69 |
63 |
56 |
50 |
44 |
38 |
32 |
25 |
19 |
+1 |
| 2 |
94 |
88 |
82 |
76 |
70 |
64 |
58 |
52 |
46 |
40 |
35 |
29 |
23 |
2 |
| 3 |
94 |
88 |
83 |
77 |
71 |
66 |
60 |
54 |
49 |
43 |
37 |
32 |
26 |
3 |
| 4 |
94 |
89 |
83 |
78 |
73 |
67 |
62 |
56 |
51 |
45 |
40 |
34 |
29 |
4 |
| 5 |
95 |
89 |
84 |
79 |
74 |
68 |
63 |
58 |
53 |
48 |
42 |
37 |
32 |
5 |
| 6 |
95 |
90 |
85 |
80 |
75 |
70 |
65 |
60 |
54 |
50 |
44 |
39 |
34 |
6 |
| 7 |
95 |
90 |
85 |
80 |
76 |
71 |
66 |
61 |
56 |
51 |
47 |
42 |
37 |
7 |
| 8 |
95 |
91 |
86 |
81 |
76 |
72 |
67 |
62 |
58 |
53 |
49 |
44 |
39 |
8 |
| 9 |
96 |
91 |
86 |
82 |
77 |
73 |
68 |
64 |
59 |
55 |
51 |
46 |
42 |
9 |
| 10 |
96 |
91 |
87 |
83 |
78 |
74 |
69 |
65 |
61 |
57 |
52 |
48 |
44 |
10 |
| 11 |
96 |
92 |
87 |
83 |
79 |
75 |
71 |
66 |
62 |
58 |
54 |
50 |
46 |
11 |
| 12 |
96 |
92 |
88 |
84 |
80 |
76 |
72 |
68 |
64 |
60 |
56 |
52 |
48 |
12 |
| 13 |
96 |
92 |
88 |
84 |
81 |
77 |
73 |
69 |
65 |
61 |
58 |
54 |
50 |
13 |
| 14 |
96 |
93 |
89 |
85 |
81 |
78 |
74 |
70 |
67 |
63 |
59 |
56 |
52 |
14 |
| 15 |
96 |
93 |
89 |
86 |
82 |
79 |
75 |
71 |
68 |
64 |
61 |
57 |
54 |
15 |
| 16 |
97 |
93 |
90 |
86 |
83 |
79 |
76 |
73 |
69 |
66 |
62 |
59 |
56 |
16 |
| 17 |
97 |
93 |
90 |
87 |
83 |
80 |
77 |
74 |
70 |
67 |
64 |
60 |
57 |
17 |
| 18 |
97 |
94 |
90 |
87 |
84 |
81 |
78 |
74 |
71 |
68 |
65 |
62 |
59 |
18 |
| 19 |
97 |
94 |
91 |
88 |
84 |
81 |
78 |
75 |
72 |
69 |
66 |
63 |
60 |
19 |
| 20 |
97 |
94 |
91 |
88 |
85 |
82 |
79 |
76 |
73 |
70 |
67 |
64 |
61 |
20 |
| t. |
0°.2 |
0°.4 |
0°.6 |
0°.8 |
1°.0 |
1°.2 |
1°.4 |
1°.6 |
1°.8 |
2°.0 |
2°.2 |
2°.4 |
2°.6 |
t. |