File:Le vol sans battement planche Launoy et Bienvenu 1784.jpg
Tamaño di bista previo: 522 × 600 pixels. Otro resolushon: 209 × 240 pixels | 418 × 480 pixels | 700 × 804 pixels.
Fail original (700 × 804 pixel, tamaño di fail: 323 KB, MIME type: image/jpeg)
Resúmen
| Deskripshon |
English: 1784.-LAUNOY and BIENVENU. -
First helicopter presented to the Academy of Sciences, composed of two propellers rotating in opposite directions under the force of a whale's bow. |
| Fecha | |
| Fuente |
Bibliothèque nationale de France |
| Outor | Mouillard, Louis-Pierre (1834-1897) |
Lisensia
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The author died in 1897, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer. 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, 1929. |
| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
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| Fecha/Ora | Miniatura | Dimenshonnan | Usuario | Komentario | |
|---|---|---|---|---|---|
| aktual | 16:47, 3 ougùstùs 2024 | | 700 × 804 (323 KB) | Kallmemel | Uploaded a work by Mouillard, Louis-Pierre (1834-1897) from {{ARK-BNF|ark:/12148/bpt6k9808755m}} with UploadWizard |
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