| 单词 | riding level |
| 释义 | > as lemmasriding level riding level n. now rare a spirit level attached to the top of the horizontal axis of an astronomical telescope or other instrument; cf. striding level at striding adj. b. ΚΠ 1825 Trans. Amer. Philos. Soc. 2 336 When the instrument is carefully levelled, the riding level is placed upon the arm t, parallel to the vertical circle, and there adjusted. 1859 E. Sabine in J. F. W. Herschel Man. Sci. Enq. (Lords Commissioners Admiralty) (ed. 3) 105 Carefully level the apparatus until the axis of the mirror is exactly horizontal, as shown by the riding-level..in all azimuths. 1903 B. Stewart et al. Less. Elem. Pract. Physics 301 In the first place the axis of the mirror must be horizontal. This adjustment is made by means of a riding level. < as lemmas |
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