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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 58
the rhombic figure (fig. 43). The crossed grating, examined without the ocular, with centrallight, gives an arrangement of the spectral images on the field (fig.42, on the right), in which the inner circle of images is identicalwith that, which Pleurosigma angulatum, under similar… … EXPERIMENTS ON THE APPLICATION OF DR. ABBEs THEORY. diagonal, and the spurious lines will appear parallel to the otherdiagonal, that is to say, perpendicular to the slit. ©r*^ If a diaphragm, perforated with a [SjXw^. cross-shaped slit, as on the left ofKs$&\w£w figure 43 admitting the central…Microscopy
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