File:Split Rock Lighthouse - Celebrating 100 Years (5183292648).jpg
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This year marks the 100th year of the first lighting of Split Rock Lighthouse. As part of the celebration, the Minnesota Historical Society has been lighting it for an hour or two on the first Friday of each month. I was fortunate enough to be able to be there for the November lighting. I have to say, seeing the lighthouse lit up is absolutely spectacular and worth it if you ever get the chance. This photo shows a closeup of the spectacular fresnel lens of this lighthouse. It is a third order lens, and is the original lens that was installed when the lighthouse was built. It is a bivalve type lens with two flash panels and it rotates, producing a flash every 12 seconds. The lens itself floats on a pool of 7 1/2 quarts of mercury. It was originally rotated by a clockworks mechanism that is driven by a counterweight that drops down a column in the center of the tower. The weight has to be wound back to the top of the tower ever few hours. The clockworks was discontinued in the 1940s when the light was electrified, but in the 1980s it was restored and is now used again to turn the lens. The lens is currently lit by a 1000 watt incandescent light bulb. |
| Date | Taken on 5 November 2010, 19:25 |
| Source | Split Rock Lighthouse - Celebrating 100 Years |
| Author | Pete Markham from Loretto, USA |
| Camera location |  | View this and other nearby images on: OpenStreetMap |  |
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This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
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This image was originally posted to Flickr by pmarkham at https://flickr.com/photos/9197427@N06/5183292648. It was reviewed on 28 March 2016 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-sa-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 05:49, 28 March 2016 | | 2,087 × 3,132 (1.6 MB) | Geo Swan (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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