Abstract
OCCASIONS frequently arise in microscopy where a working distance much greater than that given by conventional objectives for a given numerical aperture is required. This occurs in the microscopy of hot metallurgical specimens inside a vacuum furnace, the examination of electrode conditions inside a vacuum tube, various biological applications, and the examination of nuclear plates which may involve working through considerable thicknesses of glass and emulsion.
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DYSON, J. A Unit-Magnification Optical System with Long Working Distance for Microscopical Applications. Nature 163, 400 (1949). https://doi.org/10.1038/163400a0
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DOI: https://doi.org/10.1038/163400a0
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