Aerobeacon

An aerobeacon is a light assembly used to create a fixed or flashing signal visible over long distances. It consists of a high intensity electric lamp mounted with a focusing device in a cylindrical housing, which usually is rotated on a vertical axis with an electric motor. The sweep of the narrow beam thus produced gives the flashing effect. Aer...
Found on http://en.wikipedia.org/wiki/Aerobeacon
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