The microscope and its revelations . ACHROMATIC OBJECT-GLASSES. 51 Section of an AchromaticObject-glass. tliree pairs of lenses, which surpassed anything of the samekind that had been previously executed. From that time, thesuperiority of the plan of combining three pairs of lenses(Fig. 8, I, 2, 3), which should be so adjusted as to correct eachothers errors, to the telescopiccombinations adopted by , may be considered to havebeen completely established; andEnglish opticians, working on thismethod, soon rivalled the bestproductions of Continental It was in this country
The microscope and its revelations . ACHROMATIC OBJECT-GLASSES. 51 Section of an AchromaticObject-glass. tliree pairs of lenses, which surpassed anything of the samekind that had been previously executed. From that time, thesuperiority of the plan of combining three pairs of lenses(Fig. 8, I, 2, 3), which should be so adjusted as to correct eachothers errors, to the telescopiccombinations adopted by , may be considered to havebeen completely established; andEnglish opticians, working on thismethod, soon rivalled the bestproductions of Continental It was in this country thatthe next important improvementsoriginated; these being the resultof the theoretical investigationsof Mr. J. J. Lister,* which ledhim to the discovery of certainproperties in Achromatic cornbi-nations, that had not been pre-viously detected. Acting uponthe rules which he laid down,practical Opticians at once suc-ceeded in producing combinations far superior to any which hadbeen previously executed, both in ^Addeness of aperture, flatnessof field, and perfectness o
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Keywords: ., bookcentury1800, booksubjectmicroscopes, booksubjectmicroscopy
