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ABBE ABBE's adjusted advantage amplification angular aperture apochromatic objectives axis body-tube cedar oil cemented surfaces chromatic aberration chromatic difference chromatic error circles of dispersion Compensating Eye-pieces complete considerable construction correction curve definite denotes determined deviation diameter diaphragm different colours dioptrical dry objectives employed ERNST ABBE experiments eye-piece magnification eye-piece observation Finder Eye-piece finite flint glass fluorite focus full aperture given aperture gives heights high eye-pieces hitherto homogeneous-immersion image formed immersion increase Jena kinds of glass large aperture latter length of tube lens system light low eye-piece marginal ray means method microscope objectives numerical aperture objective and eye-piece obtained Optical Glass optician ordinary eye-piece overcorrection paraxial rays perfection possible produced projection eye-piece proper magnifying power ratio refractive refractive index regard require result ROYAL MICROSCOPICAL SOCIETY sample achromat SCHOTT secondary spectrum short focal length spherical aberration Spirochaeta total magnifying power tube-length violet visual angle water-immersion whole Microscope