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Optics Illustrations from the Physics Textbooks of Amédée Guillemin (1868/1882)

- July 9, 2019 in Amédée Guillemin, color, colour, crystals, light, optics, physics, René Henri Digeon

Illustrations from the 19th-century physics text books of Amédée Guillemin.

Through the First Antarctic Night (1900)

- June 21, 2019 in antarctica, aurora borealis, darkness, exploration, Frederick Cook, light, midwinter, midwinter south pole, penguins, Roald Amundsen, south pole

Journal of one of the first to spend winter on Antarctica, including more than 2 months of total darkness.