| 释义 |
ˈdipping-ˌneedle
[see dip v. 12, dip n. 4]
A magnetic needle mounted so as to be capable of moving in a vertical plane about its centre of gravity, and thus indicating by its dip the direction of the earth's magnetism. So dipping-compass, an instrument consisting of a dipping-needle with a vertical graduated circle for measuring the ‘dip’ or angle of inclination; = dip-circle.
1667Phil. Trans. II. 438 The Dipping-Needle is to be used as frequently as the former Experiment is made. 1713Derham Phys.-Theol. v. i, note 21 (R.), I have not yet been so happy to procure a tolerable good dipping-needle. 1805M. Flinders in Phil. Trans. XCV. 195 Taking the theodolite and dipping-needle, I landed. 1871Tyndall Fragm. Sc. (1879) I. xiii. 373 Previous to magnetization, a dipping needle..stands accurately level. |