Light Station Facts

Years of operation: 1910-69

Cost: $75,000 (land and buildings)

Lake Superior elevation: 602 feet above sea level

Cliff height: 130 feet

Tower height: 54 feet

Light source: Incandescent oil-vapor (kerosene) lamp, 1910-39. 1,000-watt electric bulb, 1940-69

Lens: 3rd-order bivalve Fresnel lens, manufactured by Barbier, Bernard and

Turenne Company, Paris, France

Official range: 22 miles

Flashing sequence: Once every 10 seconds (0.5-second flash every 9.5 seconds)

Tone: Siren-blast, 1910-35.

Type F diaphone ("be-you" sound), 1936-61

Sounding sequence: 2-second blast, 18 second silence

Effective range: 5 miles

Years of operation: 1910-61

Powered by: Franklin 30-HP gasoline-driven air compressors, manufactured by

Chicago Pneumatic Tool Company, 1910-31. Diesel Compressors, 1932-61