Search Results for: Optical media unrecorded
provide important information , such as the status of an airport, by the colour and rotational pattern of its airport beacon , or of pending weather as indicated on a weather beacon mounted at the top of a tall building or similar site. when used in such fashion, beacons can be considered a form of optical
culmstock, devon, england classically, beacons were fires lit at well-known locations on hills or high places, used either as lighthouses for navigation at sea , or for signalling over land that enemy troops were approaching, in order to alert defenses. as signals, beacons are an ancient form of optical...
https://en.wikipedia.org/wiki/Beacon