Curvature and Refraction. |
Table of Corrections in Feet and Decimals of a Foot. Distance
In Miles. | Curvature. | Refraction. | Correction for
Curvature
and
Refraction. | | 1/4 | | ·04 | | ·01 | | ·03 | | 1/2 | | ·17 | | ·02 | | ·15 | | 3/4 | | ·37 | | ·05 | | ·32 | | 1 | | | ·67 | | ·09 | | ·58 | | 1 | 1/2 | 1 | ·50 | | ·21 | 1 | ·29 | | 2 | | 2 | ·67 | | ·38 | 2 | ·29 | | 2 | 1/2 | 4 | ·17 | | ·60 | 3 | ·57 | | 3 | | 6 | ·00 | | ·86 | 5 | ·14 | | 3 | 1/2 | 8 | ·17 | 1 | ·17 | 7 | ·00 | | 4 | | 10 | ·67 | 1 | ·52 | 9 | ·15 | | 4 | 1/2 | 13 | ·55 | 1 | ·93 | 11 | ·62 | | 5 | | 16 | ·67 | 2 | ·38 | 14 | ·29 | | 5 | 1/2 | 20 | ·18 | 2 | ·88 | 17 | ·30 | | 6 | | 24 | ·01 | 3 | ·43 | 20 | ·58 | | 6 | 1/2 | 28 | ·18 | 4 | ·03 | 24 | ·15 | | 7 | | 32 | ·68 | 4 | ·67 | 28 | ·01 | | 7 | 1/2 | 37 | ·52 | 5 | ·36 | 32 | ·16 | | 8 | | 42 | ·69 | 6 | ·10 | 36 | ·59 | | 8 | 1/2 | 48 | ·19 | 6 | ·88 | 41 | ·31 | | 9 | | 54 | ·02 | 7 | ·72 | 46 | ·30 | | 9 | 1/2 | 60 | ·20 | 8 | ·60 | 51 | ·60 | | 10 | | 66 | ·70 | 9 | ·53 | 57 | ·17 |
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