| 单词 | index circle |
| 释义 | > as lemmasindex circle index circle n. Engineering one of the circles of holes on an index plate. ΘΚΠ society > occupation and work > equipment > machine tool > [noun] > part controlling angles, spaces, etc. > part of index circle1902 1902 Internat. Library of Technol. II. §15. 23 For convenience of measuring fractional parts of a turn of different values, as 3/ 5 of a turn, 5/ 17 of a turn,..etc., the index plate is provided with several concentric index circles, each circle having a different number of holes. 1950 J. Martin in A. W. Judge Machine Tools & Operations III. iii. 142 In ordinary plain indexing, the use of 30 holes in a 42-hole index circle would give 42/30 × 40 = 56 divisions in work. < as lemmas |
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