| 单词 | dip-sector |
| 释义 | > as lemmasdip-sector dip-sector n. a reflecting instrument on the principle of the sextant, used to ascertain the dip of the horizon: see sector n. ΚΠ 1833 J. F. W. Herschel Astronomy i. 16 The visible area, as measured by the dip-sector. 1834 Mechanics' Mag. 445. 1853 E. K. Kane U.S. Grinnell Exped. (1856) ix. 67 Minute observations of dip-sectors and repeating-circles. < as lemmas |
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