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![]() (1843–1920) from Baden arrived at Wetzlar in 1864 and entered service at the Optisches Institut. Following his early death on, his widow continued the business he had left behind, the "Optisches Institut" (optical institute). The ocular was capable of rendering an image with the correct perspective, free of the distortions typical of other microscopes at that time. 1922.Perea-Borobio CollectionĬarl Kellner, mechanic and self-taught mathematician, published his treatise Das orthoskopische Ocular, eine neu erfundene achromatische Linsencombination ( The orthoscopic ocular, a newly invented achromatic lens combination) in 1849, describing a new optical formula he had developed.
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