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03/04/1896 British desert explorer Ralph Bagnold is born

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1930 Sahara Desert exploration Egypt and Libya with Ralph A. Bagnold

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The Bagnold sun compass

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Curiosity Rover Visits the Bagnold Dunes on Mars | Video

He is known for his book The Physics of Blown Sand and Desert Dunes. It laid the foundations for the research on sand transport by wind. It is still used, even by NASA in studying sand dunes on Mars. Bagnold also invented a sun compass, which is not affected by large metal deposits found in the desert areas or by metal vehicles as a magnetic compass might be.