Application The Second Order lens was used in seacoast and warning lights to mark headlands, dangerous oceanic shoals, rocks or reefs. It was used quite frequently in the Great Lakes Lights, on islands, and in marking sounds. Two of the Great Lakes lights that were outfitted with this order of lens were White Shoal & Grosse Point. Specifications |
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| Lens height: | 81.46" | |
| Focal length: | 27.6" | |
| Weight of assembly: | 3,530 lbs | |
| Relative brightness (over sixth order): | 11.54x | |
| Useful range: | Up to 20 nautical miles | |
| Number in US Lighthouses in 1884: | 19 | |
| Number in US Lighthouses in 1922: | 26 | |
| Oil consumption per hour | 17.5 oz. | |
References Annual Report of the Lighthouse Board, 1884 The United States Lighthouse Service, Dept of Commerce, 1915 Aids to Navigation Manual, US Coast Guard, 1945 Comparative Table of Lens Orders, Mabel A. Baiges, 1988 Letter from Al & Helen Gademsky, 07/02/01 |
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