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