An engraving depicting a lighthouse optics, showing the light source surrounded by eight Fresnel echelon or lighthouse lenses. P is the weight which drives the mechanism for revolving the lens, M, which includes a governor for regulating the speed. Dated 19th century
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Image Number: 1746-29960671Rights ManagedCredit Line:World History Archive/Image Asset Management/SuperStockCollection:Image Asset Management Contributor:World History Archive Model Release:NoProperty Release:NoResolution:4045×5184
