tourmaline tongs

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African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

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Facts and Figures About the Landings on Omaha Beach During the Normandy Invasion on June 6, 1944

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San Francisco, California/USA-1/18/20: Womens March at Civic Center marching with signs of political protest regarding equality also embracing 2020 presidential candidates and celebrating equality

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Nelson Mandela, undated photo.

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tourmaline tongs

light polarizing device

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use of tourmaline

In tourmaline
…simple polarizing apparatus known as tourmaline tongs.
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