| 摘要 |
A stylus whose position is to be determined is attached to ends of two strings. The other ends of the strings are wrapped around and attached to a pair of spring-biased, rotatable drums. When the stylus is moved, one or both of the drums rotate to accommodate the change in length of the strings and the angular positions of the drums therefore correspond with the position of the stylus. The drum angles are measured by angle transducers whose outputs are processed by a computer to provide a reading of the stylus position.
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