Box Heliotrope 3/7 Deployed : 無料・フリー素材/写真
Box Heliotrope 3/7 Deployed / signal mirror
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
|---|---|
| 説明 | Box heliotrope with the box open, and the primary mirror (left end) and sights (center, right) deployed, ready to mount and align. Note that the manual is by a different manufacturer, and for a slightly different model, than this example.The heliotrope is a surveying device which serves as a long range target marker for a surveyor. It reflects sunlight, and in clear weather is easily visible at ranges of over 20 miles. This box heliotrope is similar to, though different in construction from, the US military MilSpec MIL-H-20194 "Heliotrope, Surveying, Box-Type, with case" [1], whose use is described in the US Army Technical Manual TM-532 [2]. There are some nice photos of this type at the USGS site.To view more detail, see the full resolution photo.[1] MilSpec MIL-H-20194MilSpec MIL-H-20194 at ASSIST.[2] TM 5-232 Elements of surveyingbooks.google.com/books?id=564XAAAAYAAJ&pg=SA4-PA40 |
| 撮影日 | 2014-02-23 14:05:34 |
| 撮影者 | signal mirror |
| タグ | |
| 撮影地 | |
| カメラ | DMC-FZ28 , Panasonic |
| 露出 | 0.05 sec (1/20) |
| 開放F値 | f/8.0 |