Magnification and Micron Bars
Micrographs usually have micron bars, or magnifications, or both.
Magnification is a ratio between size of object on a picture and its real size. Unfortunately, magnification is somewhat a misleading parameter. It depends on a final size of a printed picture, and therefore varies with variation in picture size. Editors of Journals and Magazines routinely resize a figure to fit the page, making any magnification number provided in the figure legend incorrect. Scale Bar (or Micron Bar) is a bar of known length displayed on a picture. The bar can be used for measurements on a picture. When a picture is resized a bar is resized with also. If a picture has a bar, the right magnification can be easily calculated. Ideally, all pictures intending for publication/presentation should be supplied with a scale bar; magnification is optional. All but one (of a limestone) micrographs, presented on this page do not have a micron bar; supplied magnifications are the wrong ones (they were not calculated for pictures of present size).
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Famous quotes containing the word bars:
“The last public hanging in the State took place in 1835 on Prince Hill.... On the fatal day, the victim, a man named Watkins, peering through the iron bars of his cell, and seeing the townfolk scurrying to the place of execution, is said to have remarked, ‘Why is everyone running? Nothing can happen until I get there.’”
—Administration for the State of Con, U.S. public relief program (1935-1943)