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