Vintage Koehler brass mining safety lamp was used to help in the detection of low oxygen levels and explosive gases. Flame height was the primary indicator of this, and the lines on the glass helped to differentiate potential hazards prior to miners' entry.Navy and Coast Guard used these lamps in roughly the mid 20th century to help in the detection of gas leaks aboard vessels. Awesome piece of history, actually featured in many USA museum gallery's! Condition is "Used" but not extremely worn, still shines! The item "Rare Antique Koehler Brass Miners Mining Safety Lamp Light #289-1A nautical ship" is in sale since Saturday, December 19, 2020. This item is in the category "Collectibles\Science & Medicine (1930-Now)\Mining\Equipment". The seller is "agelivant-69" and is located in Federal Way, Washington. This item can be shipped worldwide.