======+=============================================================================+====== _t_ | Difference between the dry and wet thermometers (_t-t′_). | _t_ (Dry +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+(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|ther.) ------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+------ 55 | -8 | | | | | | | | | | | | | 55 56 | -2 | -19 | | | | | | | | | | | | 56 57 | +2 | -10 | -48 | | | | | | | | | | | 57 58 | 6 | -3 | -22 | | | | | | | | | | | 58 59 | 9 | +1 | -12 | | | | | | | | | | | 59 | | | | | | | | | | | | | | 60 | 12 | 5 | -5 | -25 | | | | | | | | | | 60 61 | 15 | 9 | 0 | -14 | | | | | | | | | | 61 62 | 18 | 12 | +5 | -6 | -28 | | | | | | | | | 62 63 | 20 | 15 | 9 | 0 | -14 | | | | | | | | | 63 64 | 22 | 18 | 12 | +4 | -6 | -32 | | | | | | | | 64 | | | | | | | | | | | | | | 65 | 24 | 20 | 15 | 9 | 0 | -16 | | | | | | | | 65 66 | 26 | 22 | 18 | 12 | +4 | -7 | -34 | | | | | | | 66 67 | 28 | 24 | 20 | 15 | 9 | -1 | -16 | | | | | | | 67 68 | 30 | 26 | 23 | 18 | 12 | +4 | -7 | -37 | | | | | | 68 69 | 32 | 28 | 25 | 20 | 15 | 8 | 0 | -17 | | | | | | 69 | | | | | | | | | | | | | | 70 | 33 | 30 | 27 | 23 | 19 | 12 | +5 | -7 | -39 | | | | | 70 71 | 35 | 32 | 29 | 25 | 21 | 16 | 9 | 0 | -17 | | | | | 71 72 | 37 | 33 | 31 | 27 | 23 | 18 | 13 | +5 | -6 | -39 | | | | 72 73 | 38 | 35 | 32 | 29 | 25 | 21 | 16 | 10 | 0 | -16 | | | | 73 74 | 40 | 37 | 34 | 31 | 28 | 24 | 19 | 13 | +6 | -6 | -37 | | | 74 | | | | | | | | | | | | | | 75 | 42 | 39 | 36 | 32 | 30 | 26 | 22 | 16 | 10 | 0 | -16 | | | 75 76 | 43 | 41 | 38 | 34 | 32 | 28 | 24 | 20 | 14 | +6 | -6 | -34 | | 76 77 | 45 | 42 | 40 | 36 | 33 | 30 | 26 | 22 | 17 | 11 | +1 | -14 | | 77