Giant Electric Sign Is Carried by Plane (Apr, 1940)
Giant Electric Sign Is Carried by Plane
Called the largest of its kind in the world, a flying electric advertising sign is suspended beneath the lower wing of a large transport plane. Designed to be read at an altitude of 3,000 feet, the sign is of the “traveling” typeâ€”complete sentences travel across its face in moving letters as lights are switched on and off by means of an intricate control mechanism installed within the plane fuselage. A motor-driven, 4,500-watt generator supplies the necessary electric current to light the 1,000 lamps of the flying billboard.