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Title: What Is A Sphere? How Are They Made? How Are They Measured And How Are They Used In Metrology?
Author(s): [Not Available]
Source: 2000 Measurement Science Conference
Year Published: 2000
Abstract: The word sphere first appeared in the written English language in 1300. The early concept of a sphere was that of a radius being rotated 360 degrees around a line axis terminating in two poles, see (Figure # 1. A.). The modern technical definition of a sphere might be a three dimensional closed body with all points on its surface at an equal distance from a single central point, see (Figure # 1. B.). There are two basic techniques used for finishing precision balls.

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