| 单词 | sphere of projection |
| 释义 | > as lemmassphere of projection d. Crystallography. sphere of projection: an imaginary sphere surrounding a crystal, on to which a point in each face of the crystal is projected; cf. projection n. 2c. ΚΠ 1878 H. P. Gurney Crystallogr. 32 The diameter of the sphere of projection which is at right angles to the zone plane is called the zone axis. 1895 N. Story-Maskelyne Crystallogr. ii. 27 On the sphere of projection, and the principles of its stereographic representation. < as lemmas |
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