Small Objects and Maps
Observing a nearby small object without a magnifying glass or a microscope, the optimal distance is 20–25 cm. At this close range, 0.05 mm can be seen clearly. The accuracy of a measurement ranges from 0.1 to 0.3 mm and depends on the experience of the observer. The latter figure is the usual positional accuracy of faint details in maps and technical plans.
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Famous quotes containing the words small, objects and/or maps:
“Thirty-five years ago, when I was a college student, people wrote letters. The businessman who read, the lawyer who traveled; the dressmaker in evening school, my unhappy mother, our expectant neighbor: all conducted an often large and varied correspondence. It was the accustomed way of ordinarily educated people to occupy the world beyond their own small and immediate lives.”
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