File:EB1911 - Lighthouse - Fig. 30—Modern Parabolic Reflector.jpg
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EB1911_-_Lighthouse_-_Fig._30—Modern_Parabolic_Reflector.jpg (177 × 424 pixels, file size: 40 KB, MIME type: image/jpeg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 19:54, 29 October 2020 | 177 × 424 (40 KB) | DivermanAU | Uploaded a work by {{anonymous}} from Encyclopædia Britannica (11th ed.), v. 16, 1911, "Lighthouse" article, pp. 631 ff.; modified from https://www.gutenberg.org/files/41472/41472-h/41472-h.htm#ar2 with UploadWizard |
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