| Credit: | unknown photographer |
|---|---|
| Date: | 1864 |
| Negative Size: | stereo |
| Equipment: | flag; ladder |
| Locations & Lines: | Maryland; Potomac River; Virginia |
| Military Units: | Signal Corps; US Army |
| Persons: | Brown (J. W.) |
| Structures & Establishments: | Chain Bridge signal station (Potomac River); Chain Bridge signal tower (Potomac River) |
| Sources: | USAMHI – MOLLUS collection |
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