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Reference.org
Magnesium torch
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<p>A magnesium torch is a bright light source made from <a href="/facts/Magnesium/XyIhd2FG">magnesium</a>, which can burn underwater and in all weather conditions. They are used for emergency illumination for railroad applications. They were also used in the 1950s up to the early 1970s as a light source for <a href="/facts/Scuba_diving/BEvQImbN">scuba diving</a>, and were featured occasionally in television shows. A relay of magnesium torches was used to transfer the Olympic flame from Greece to the site of the Olympic games several times since the first occasion at the 1936 Berlin Games. </p>