Hendrik Antoon Lorentz, in a classroom. Lorentz is leaning on a book placed on the table in front of him. He is wearing a suit, a bow tie and eyeglasses. A piece of chalk is on the table, to his left. A blackboard, with mathematical notations, is visible in the background. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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