File:Inner Range Light Lens.webm

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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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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

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w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
Attribution: Pete Markham
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
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/TimeThumbnailDimensionsUserComment
current14:05, 30 November 202040 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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Format Bitrate Download Status Encode time
VP9 720P 2.12 Mbps Completed 14:07, 30 November 2020 1 min 13 s
VP9 480P 1.09 Mbps Completed 14:06, 30 November 2020 1 min 3 s
VP9 360P 631 kbps Completed 14:06, 30 November 2020 42 s
VP9 240P 364 kbps Completed 14:06, 30 November 2020 34 s
WebM 360P 580 kbps Completed 14:06, 30 November 2020 23 s
QuickTime 144p (MJPEG) 953 kbps Completed 04:33, 6 November 2024 4.0 s

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