English: Mechanical devices for communicating messages by a physical movement. Some use the same moving flags as manual semaphore, others use an alternative arrangement, often a shutter showing either black or white. For the railway signals with a moving arm, see Semaphore signals
This category has only the following subcategory.
- ► Semaphore in Bremerhaven (8 F)
Media in category "Mechanical semaphores"
The following 8 files are in this category, out of 8 total.