File:Screwpropellor.jpg
Screwpropellor.jpg (215 × 210 pixels, file size: 9 KB, MIME type: image/jpeg)
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| Description | Selected out of original Wiki image by Gerald Zuckier. |
| Date | before 14:37, 2. Jul. 2005 |
| Source | en:Image:Screwpropellor.JPG Detail of Bushnell's Turtle picture, showing hand-cranked screw propellors for vertical and horizontal propulsion. Detail of Bushnell's Turtle picture |
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This image is in the public domain because it contains materials that originally came from the U.S. National Oceanic and Atmospheric Administration, taken or made as part of an employee's official duties.
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