Posted by Jock on October 22, 2007 at 18:24:04 from 87.105.81.146 user Jock.
In Reply to: Signal Stations posted by Ed Kiser on October 22, 2007 at 15:59:29:
a system for communication across great distances by the use of
a series of watch towers, each within sight of the next. A signal
from one could be seen by the next one, and then relayed on to the
more distant tower.
In the 18th C. the French improved on the Roman system by building
signal towers with mechanical semaphores. The British soon developed
their own rival system.