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File:Looking up into the third-order Fresnel lens at Au Sable (4a1a41a5-5250-4380-8aa7-8d79b1e55bd2).JPG

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Camera location46° 40′ 21.83″ N, 86° 08′ 22.54″ W  Heading=93.45703° Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

Summary edit

English: Looking up into the third-order Fresnel lens at Au Sable
Photographer
English: NPS Photo
Title
English: Looking up into the third-order Fresnel lens at Au Sable
Description
English:

Glass pieces make up the lens. The glass pieces are prism shaped and help amplify the light so it can be seen further.

A third-order Fresnel lens reflected the first light. The fixed white beam could be seen 17 miles out on Lake Superior. The lighthouse became fully automated in 1958 and transferred from the Coast Guard to the National Park Service in 1968.

  • Keywords: Pictured Rocks National Lakeshore; Pictured Rocks; piro; Au Sable Light Station; au sable; lighthouse; lake superior
Depicted place
English: Pictured Rocks National Lakeshore, Alger County, Michigan
Date Taken on 2 August 2018
Accession number
4a1a41a5-5250-4380-8aa7-8d79b1e55bd2
Source
English: NPGallery
Permission
(Reusing this file)
Public domain This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.
NPS Unit Code
InfoField
PIRO

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current17:48, 14 January 2022Thumbnail for version as of 17:48, 14 January 20223,024 × 4,032 (3.07 MB)BMacZeroBot (talk | contribs)Batch upload (Commons:Batch uploading/NPGallery)

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