Experiments on Mr. Babbage's Method of Distinguishing Light-houses: Reported to a Committee of the United States Light-House Board

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U.S. Government Printing Office, 1861 - Lighthouses - 116 pages

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Page 6 - it seems to be a natural consequence of the physical distribution of light that fixed lights which illuminate the whole horizon should be less powerful than revolving lights which have their effect concentrated within narrow sectors of the horizon.
Page 103 - itself was visible from where I stood, the deviation of the supposed

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