Title:
Chicago, Illinois: September 4, 1930 The 'sun-flash beacon' atop the new LaSalle-Wacker building. The eight parabolic mirrors are five feet tall and three feet wide and magnify and reflect the sun's rays during the day and red neon lights at night. © Underwood Archives / The Image Works
Caption:
Chicago, Illinois: September 4, 1930 The 'sun-flash beacon' atop the new LaSalle-Wacker building. The eight parabolic mirrors are five feet tall and three feet wide and magnify and reflect the sun's rays during the day and red neon lights at night. © Underwood Archives / The Image Works