The microscope : its construction and management : including technique, photo-micrography, and the past and future of the microscope (1893)
Heurck, Henri van, 1838-1909 · London : C. Lockwood ; New York : D. Van Nostrand Co. · leaf 209
diatoms mounted with a cover glass, the objective is ofgreat value. It has a very large frontal distance, as well as a considerablemagnifying power, and for many years we have constantly employed itfor the purposes just mentioned above. No. 7 (i-cjth inch). A good objective, with a numerical… … No. 10 water immersion (i-iSth inch, N.A. i2o). The image of thepygidium is clear and pure. The Podura is clear, and of a good blackcolour, which signifies quasi apochromatic achromatisation. The Pkurosigma resolved well in axial illumination, and the edges of fractures clearlyshew the stamp paper…
Microscopy
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