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Fast facts about Split Rock Lighthouse

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news Bemidji, 56619

Bemidji Minnesota P.O. Box 455 56619

Fast facts about Split Rock Lighthouse

The Split Rock Lighthouse was in operation from 1910 to 1969. Here are some facts about the site:

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- 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, 1940-1969.

- Lens - third-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, 1910-1935. Type F diaphone "be-you" sound, 1936-1961.

- Sounding sequence - 2-second blast, 18-second silence.

- Effective range - 5 miles.

- Powered by Franklin 30-horsepower gasoline-driven air compressors, manufactured by Chicago Pneumatic Tool Company, 1910-19031; diesel compressors, 1932-1961.

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