| 单词 | reflecting circle |
| 释义 | > as lemmasreflecting circle reflecting circle n. now historical a navigational and surveying instrument that uses the same principle as the sextant but with a full circle rather than an arc.The instrument consists of a metal circle graduated in degrees, an arm with a sighting telescope and a horizon mirror, and another arm with a second mirror. The principle was described by T. Mayer in Commentarii Societatis Regiae Scientiarum Gottingensis 1752 2 325. ΚΠ 1788 Analyt. Rev. Sept. 122 The reflecting circle was invented by Mayer, about twelve years ago. 1799 tr. J. F. G. de la Perouse Voy. Round World (ed. 2) I. 321 Four reflecting circles, by M. de Borda, to observe the heights and distances of the stars. 1843 J. C. Frémont Rep. May in D. Jackson & M. L. Spence Exped. J. C. Frémont (1970) I. 482 One reflecting circle, by Gambey. Two sextants, by Troughton. 1920 P. P. Blackburn White's Elements Theoret. & Descriptive Astron. (ed. 8) ii. 47 The reflecting circle is still another modification of the sextant. 2006 M. W. Jackson Harmonious Triads v. 119 The father was renowned for his manufacture of precision optical instruments..such as high-precision thermometers and a reflecting circle (Spiegelkreis). < as lemmas |
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