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)
Summary
| Description |
English: Lighthouse - Modern Parabolic Reflector |
| Date | |
| Source | 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 |
| Author | Anonymous |
Licensing
|
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1930.
 Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 20:54, 29 October 2020 | | 177 × 424 (40 KB) | wikimediacommons>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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