File:Third order Fresnel lens of the Au Sable Lighthouse (0168962d-df12-4380-a22e-4d97efc967b9).JPG

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English: Third order Fresnel lens of the Au Sable Lighthouse
Photographer
English: NPS Photo
Title
English: Third order Fresnel lens of the Au Sable Lighthouse
Description
English:

Prism glass pieces make up the lens. It is 62 inches tall.

Third-order Fresnel lens reflected the first light, which was fueled initially by lard oil and then by kerosene. The fixed white beam could be seen 17 miles out on the lake.

  • 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 20 August 2017
Accession number
0168962d-df12-4380-a22e-4d97efc967b9
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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current04:24, 13 January 2022Thumbnail for version as of 04:24, 13 January 20223,024 × 4,032 (2.44 MB)BMacZeroBot (talk | contribs)Batch upload (Commons:Batch uploading/NPGallery)

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