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 374
improvement. At this period Selhgue had a microscopeconstructed by Messrs. Vincent and Charles Chevalier, which was calledachromatic. In the instrument (fig. 225) which was constructed from the specifi-cations of Selligue, a mechanician, there are three or four plano-convexachromatic lenses… … 354 THE MICROSCOPE IN THE PAST AND IN THE FUTURE. The lenses are i2^mm. (| inch) in diameter, and of about 37mm.(i£ inches) focus. Immediately above the upper lens there is a very small diaphragm,the aperture of which is scarcely 2jmm. (i-ioth inch) in diameter. The images do not shew much colour,…
Microscopy
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