LOC's Public Domain Archive
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![American telegraph system, semaphoric as well as magnetic. American semaphore or marine signals, connected with the electro-magnetic telegraph. Rogers & Black, patentees of the semaphore-Henry O'Rielly, Agent for the U. S. [n. p. n. d.].](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzIwMTkvMDkvMDQvYW1lcmljYW4tdGVsZWdyYXBoLXN5c3RlbS1zZW1hcGhvcmljLWFzLXdlbGwtYXMtbWFnbmV0aWMtYW1lcmljYW4tc2VtYXBob3JlLTBmYWE0My02NDAuanBn/40/67/webp "American telegraph system, semaphoric as well as magnetic. American semaphore or marine signals, connected with the electro-magnetic telegraph. Rogers & Black, patentees of the semaphore-Henry O'Rielly, Agent for the U. S. [n. p. n. d.].")
