Beacon 4 : A warning light with rotating lamps, similar to a lighthouse beacon. The Federal Beacon Ray was once the standard for all fire apparatus prior to the invent of the light bar
Pacific Northwest Chapter of The Society for the Preservation and Appreciation of Antique Motorized Fire Apparatus in America SPAAMFAA, Fire Apparatus Terminology, La Center, Washington, USA 2002. (Fr Srvc - Amer) {455}