. Pathogenic micro-organisms. A text-book of microbiology for physicians and students of medicine. (Based upon Williams' Bacteriology). Bacteriology; Pathogenic bacteria. 20 BACTERIOLOGY correction may be thanged by altering,the distance between these component lenses, as, for example, in an objective equipped with a correction pollar. Objectives corrected in respect to spherical aberration are designated as aplanatic. Restriction of the size of the field is also an important factor in making it appear flat. Light of different wave lengths (different colors) is refracted to a different degree
. Pathogenic micro-organisms. A text-book of microbiology for physicians and students of medicine. (Based upon Williams' Bacteriology). Bacteriology; Pathogenic bacteria. 20 BACTERIOLOGY correction may be thanged by altering,the distance between these component lenses, as, for example, in an objective equipped with a correction pollar. Objectives corrected in respect to spherical aberration are designated as aplanatic. Restriction of the size of the field is also an important factor in making it appear flat. Light of different wave lengths (different colors) is refracted to a different degree by the simple lens, so that, for example, the violet rays are brought to a focus earlier than the red rays, with the remainder of the spectrum spread out between. This defect is known as chromatic aberration. It is corrected to a very con- siderable extent by combining biconvex lenses of crown glass. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original MacNeal, Ward J. , 1881-1946; Williams, Herbert Upham, 1866-. Philadelphia, P. Blakiston's Son & Co.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbacteri, bookyear1920
