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Knight's Mechanical Encyclopedia (ed. Knight), M. (search)
ns, prismatic illuminator, dark well, parabolic reflector, lieberkuhn, polarizing prism, micrometer, camera for delineating objects, etc., which tend to augment the price, so that a complete compound microscope costs from $300 to $1,000. The binocular microscope is, of course, still more expensive, the price in some instances reaching $15,000. A good instrument, however, amply sufficing for the wants of ordinary amateur observers, may be obtained for $100. See Carpenter on the microscope ; Hogg's History of the microscope, etc. The investigations of Leuwenhoeck, Schwammerdam, and the earlier microscopic inquirers, were conducted by means of single lenses, the compound microscope being esteemed comparatively untrustworthy, its true theory being imperfectly understood. In 1829, Mr. J. J. Lister published the results of his investigations into the laws governing the aberrations of lenses, and gave practical directions for correcting them by combinations of lenses so arranged that