Artificial Light

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A real practical limitation which still exists is thecurvature of the earth, and the distance an object may be seen by theeye at sea-level depends upon the height of the object. The relation isapproximately expressed thus, -- Range in nautical miles = 8/7 square root of Height of object infeet. For example, the top of a tower 100 feet high is visible to an eyeat sea-level a distance of 8/7 square root of 100 = 80/7 = 11. 43miles. Now if the eye is 49 feet above sea-level, a similar computationw...ill show how far away it may be seen by the original eye at sea-level. This is 8/7 square root of 49 = 8 miles. Hence an eye 49 feet abovesea-level will be able to see the top of the 100-foot tower at adistance of 11. 43 + 8 or 19. 43 nautical miles. Under these conditions animaginary line drawn from the top of the tower to the eye will be justtangent to the spherical surface of the sea at a distance of 8 milesfrom the eye and 11. 43 miles from the tower.
The luminous intensity of a light-source or of the beam of light isdirectly responsible for the range.


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