On angular aperture of objectives for the microscope : read before the Microscopical Congress at Indianapolis, Ind., August 15th, 1878 / by Geo. E. Blackham.

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On angular aperture of objectives for the microscope : read before the Microscopical Congress at Indianapolis, Ind., August 15th, 1878 / by Geo. E. Blackham. Credit: Wellcome Collection. Public Domain Mark