Last modified on 23 March 2012, at 17:29

Category:Mechanical semaphores

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.


Media in category "Mechanical semaphores"

The following 11 files are in this category, out of 11 total.