 | Atlantic and Gulf coasts of the United States - 1894 - 208 páginas
...an observer whose eye is at the sea level; in practice, therefore, it is necessary to add to those a distance of visibility corresponding to the height...— Sandy Hook Light seen just at the horizon, what, nnder ordinary conditions of the atmosphere, in its distance from the observer T Height (according... | |
 | 1907 - 274 páginas
...an observer whose eye is at the lake level; in practice, therefore, it is necessary to add to these a distance of visibility corresponding to the height of the observer's eye above the lake level. For example, you pick up Thunder Bay Island light and then by reference to the lists... | |
 | International Correspondence Schools - 1911 - 450 páginas
...an observer whose eye is at the sea level; in practice, therefore, it is necessary to add to these a distance of visibility corresponding to the height of the observer's eye above sea level. Example, — A light 90 ft. high is seen just at the horizon; height of observer is 15 ft. What, under ordinary... | |
 | United States. Bureau of Light-Houses - 1923 - 850 páginas
...by an observer whose eye is at lake level ; in practice, therefore, it is necessary to add to these a distance of visibility corresponding to the height of the observer's eye above lake level. In some instances the actual or luminous range given in the Buoy List may be less than... | |
 | United States. Bureau of Light-Houses - 1928 - 568 páginas
...seen by an observer whose eye is at sea level; in practice, therefore, itis necessary to add to these a distance of visibility corresponding to the height of the observer's eye above sea level. The luminous range is given in this List when the light is not of sufficient power to be seen to the... | |
 | United States. Bureau of Light-Houses - 1931 - 572 páginas
...seen by an observer whose eye is at sea level; in practice, therefore, it is necessary to add to these a distance of visibility corresponding to the height of the observer's eye above sea level. Distances of visibility for objects of various elevations above sea level Candlepowers of lights are... | |
 | United States. Bureau of Light-Houses - 1933 - 1122 páginas
...seen by an observer whose eye is at sea level; in practice, therefore, it is necessary to add to these a distance of visibility corresponding to the height of the observer's eye above sea level. Distances of visibility for objects of various elevations above sea level <andlf powers of lights are... | |
 | United States. Bureau of Light-Houses - 1928 - 1522 páginas
...Dixtancti of risibility for objecta of various il> nitìmix nli/in am I, EXAMPLE. — Minots Ledge Light, seen just at the horizon, what, under ordinary conditions of the atmpsphere, is its distance from the observer? Height (according to Light List), 85 feet, distance... | |
 | United States. Coast Guard - 1937 - 1820 páginas
...seen by an observer whose eye is at sea level; in practice, therefore, it is necessary to add to these a distance of visibility corresponding to the height of the observer's eye above sea level. Distances of visibility for objects of various elevations above sea level Candlepowers of lights are... | |
 | U.S. Coast and Geodetic Survey - 1951 - 630 páginas
...seen by an observer whose eye is at sea level; in practice, therefore, it is necessary to add to these a distance of visibility corresponding to the height of the observer's eye above sea level. Height, feet Nautical Statute miles Height, feet Nautical miles Statute miles Height, feet Nautical... | |
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The table following gives the approximate geographic range of visibility for an object which may be seen by an observer whose eye is at sea level; in practice, therefore, it is necessary to add to these a distance of visibility corresponding to the height... 
