US Signal Corps Heliograph Mirror Bar Case K&E 1/2 : 無料・フリー素材/写真
US Signal Corps Heliograph Mirror Bar Case K&E 1/2 / 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 is the mirror bar case for a US Signal Service heliograph, made by Keuffel & Esser (K&E) for the US Forest Service. It is described in [1] as "CASE, type BG-34, Carrying: a small sole-leather case, with nickeled brass fittings, sliding by means of 2 loops upon the carrying strap of Case, type BG-35; Dimensions, 13 by 2 1/2 by 1 1/8 inches; used to contain mirror bar, type HL-3 in Set, heliograph, type EE-16. Drawing-32501C6. Numerical code 800-529.Collage of photographs against a 1" grid with 10 minor divisions per inch. Note that parallax effects make the grid less useful than it might be - note the the case looks longer in the side photos (since it has more depth) than in the front and back photos.[1] Storage Catalogue: Signal Corps United States. Army. Signal Corps. G.P.O. 1920archive.org/details/storagecatalogu00unkngoog |
| 撮影日 | 2013-11-23 22:14:01 |
| 撮影者 | signal mirror |
| タグ | |
| 撮影地 | |
| カメラ | DSC-RX100M2 , SONY |
| 露出 | f/11.0 |
| 開放F値 | f/11.0 |