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Hermann Ludwig Ferdinand von Helmholtz (1821-1894). German physicist and physiologist, giving a lecture on 7 July 1894. Opthalmascope
Hermann Ludwig Ferdinand von Helmholtz (1821-1894). German physicist and physiologist. Opthalmascope. Engraving published 1876
Hermann Ludwig Ferdinand von Helmholtz, c1900. Helmholtz (1821-1894), German physicist and physiologist, inventor of the ophthalmascope (1850)
Hermann Ludwig Ferdinand von Helmholtz, 1907. Helmholtz (1821-1894), German physicist and physiologist, inventor of the ophthalmascope (1850)
Hermann Ludwig Ferdinand von Helmholtz (1821-1894). German physicist and physiologist. Opthalmascope. From La Nature, Paris, 1894. Engraving
