<p>Prism glass pieces make up the lens. It is 62 inches tall.</p>
<p>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.</p>
<ul><li>Keywords: Pictured Rocks National Lakeshore; Pictured Rocks; piro; Au Sable Light Station; au sable; lighthouse; lake superior</li></ul>
NPS Photo
Taken on 20 August 2017
<a rel="nofollow" class="external text" href="https://npgallery.nps.gov/">NPGallery</a>