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On angular aperture of objectives for the microscope : read before the Microscopical Congress at Indianapolis, Ind., August 15th, 1878 (1880)
Blackham, Geo. E. (George E.), National Microscopical Congress (1878 : Indianapolis, Ind.) · New York : Industrial Publication Co. · leaf 33
FlGT'BE 2. Scale X 100. … Geo. E. Slaekhtm, m.Microscopy · Lenses · Geometrical optics
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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