Archive image from page 647 of Das mikroskop Theorie, gebrauch, geschichte. Das mikroskop. Theorie, gebrauch, geschichte und gegenwärtiger zustand desselben dasmikroskoptheo00hart Year: 1859 G22 Brewster. Coddinffton. Fig. 237. Fiff. 238. Fis. 239. Brewster's ringförmig ver- tiefte Kugel.

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