Edmund Hartnack (1826–91)

German microscope maker. Studied with Hirschmann in Berlin, and worked with Ruhmkorff and then Oberhäuser in Paris from 1847. Took over the business in partnership with the Polish refugee Prazmowski from 1864. Went to Potsdam in 1870 on the outbreak of the Franco-Prussian War, and sold the Paris business to Prazmowski in 1879.