Painting with light c. 1943. Delano, Jack-Indiana Harbor Belt RR, switchman demonstrating signal with a "fusee" - used at twilight and dawn - when visibility is poor-This signal means "back up" Calumet City, Ill 1943 Jan
January 1943. Calumet City, Ill. "This signal means stop" 4x5 Kodachrome transparency by Jack Delano.
Jack Delano, Light Painting Photography, 1943