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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Page 2 - 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 99 - itself was visible from where I stood, the deviation of the supposed
Bibliographic information
| Title | Experiments on Mr. Babbage's Method of Distinguishing Light-houses: Reported to a Committee of the United States Light-House Board |
| Author | John Henry Alexander |
| Contributor | United States. Light-House Board |
| Publisher | U.S. Government Printing Office, 1861 |
| Original from | the New York Public Library |
| Digitized | Apr 27, 2006 |
| Length | 116 pages |
| Export Citation | BiBTeX EndNote RefMan |