US SIgnal Service Heliograph Sighting Rod, Queen & Co., Philidelphia : 無料・フリー素材/写真
US SIgnal Service Heliograph Sighting Rod, Queen & Co., Philidelphia / signal mirror
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
|---|---|
| 説明 | This US SIgnal Service Heliograph Sighting Rod is stamped "Queen & Co., Phila" on the head. Queen & Company of Philidalphi advertised a heliograph in their catalog (copyrighted 1898, but saying 1903 on the cover) hereThis heliograph sighting rod is from a private collection.The full-resolution version of this image is available here |
| 撮影日 | 2013-10-26 14:10:14 |
| 撮影者 | signal mirror |
| タグ | |
| 撮影地 | |
| カメラ | DMC-FZ28 |
| 露出 | 0.25 sec (1/4) |
| 開放F値 | f/8.0 |