L. Knaus, 1881.; Photograph of a Painting; Reproduction of an 1881 painting by Knaus from the Deutsches Museum, Germany. Image shows Helmholtz with apparatus relating to his career: optical equipment (including what may be an ophthalmoscope) and a tuning fork. 2 copies.; Photograph of painting
Collection:
Edgar Fahs Smith Image Collection (University of Pennsylvania)
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