Excellent condition, strong, dark ink signature on 4 1/4" x 2 3/4" card. "John Tyndall".

John Tyndall (1820-1893) was one of the greatest scientists of the 19th century. He made important contributions in physics, atmospheric science and geology. Tyndall was also a gifted public lecturer, an avid promoter of the public understanding of science, and a noted mountaineer. He is best remembered popularly as the man who first explained why the sky is blue.

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