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[edit] Summary

Sulfur lamp diagram from the US Department of Energy

Source: http://americanhistory.si.edu/lighting/tech/sul.htm

[edit] Licensing

Public domain This work is in the public domain in the United States because it is a work of the United States Federal Government under the terms of 17 U.S.C. § 105. See Copyright.

Note: This only applies to works of the Federal Government and not to the work of any individual US state, territory, commonwealth, county, subdivision, or municipality.

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