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 35
Spherical Aberration. Every lens may be considered as formed of a system of prisms,or of parts of prisms (planes tangent to the lens), and having widerand wider angles. Thus a deviation is produced, which becomes moreand more considerable, according as the edges of the lens areapproached, and which… … This way of regarding lenses is identical with that which we havegiven (page 3) for spherical mirrors, and this unequal deviation fordifferent parts of the lens is called spherical aberration. Spherical aberration is a serious defect, which the optician tries toremove as far as possible by…
Microscopy
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![An illustration from Original microscopic drawings made between the years 1824 and 1840 mostly published in works by Dr. Goring & A. Pritchard [graphic]. (1824)](https://img.insideoutlibrary.com/img/200/wellcome-wellcome_b21301177-33-2.webp)
