File:Inner Range Light Lens.webm
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Size of this JPG preview of this WEBM file: 800 × 450 pixels. Other resolutions: 320 × 180 pixels | 640 × 360 pixels | 1,280 × 720 pixels.
Original file (WebM audio/video file, VP9/Opus, length 40 s, 1,280 × 720 pixels, 3.63 Mbps overall, file size: 17.25 MB)
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Summary[edit]
| Description |
English: This video shows the original Duluth South Pier Inner Range Light fresnel lens in motion. It rotated around the light source and has flash panels that focused the light into distinct beams. This made the light appear to flash when viewed from a distance.
Originally, the mechanism that rotated the lens was a clockworks that worked very much like a large grandfather clock. Today it is rotated by an electric motor. The clockworks is still intact -- it is just no longer used. This lens is on display in the Canal Park Marine Museum in Duluth, MN. It was removed from the lighthouse in 1995 due to deterioration of the lens. It was restored and placed on display inside the museum. The lighthouse now used a plastic fresnel lens that is rotated by an electric motor. |
| Date | |
| Source | Inner Range Light Lens - Flickr |
| Author | Pete Markham |
Licensing[edit]
This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
Attribution: Pete Markham
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This file, which was originally posted to
https://www.flickr.com/photos/pmarkham/7572655592/in/photolist-koZFKs-cxaQFs-5PVbz9-6Cd7jp, was reviewed on 7 February 2021 by reviewer LicenseReviewerBot, who confirmed that it was available there under the stated license on that date.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:05, 30 November 2020 | 40 s, 1,280 × 720 (17.25 MB) | JotaCartas (talk | contribs) | Imported media from https://www.flickr.com/photos/pmarkham/7572655592/in/photolist-koZFKs-cxaQFs-5PVbz9-6Cd7jp |
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