| 单词 | tangent screw |
| 释义 | > as lemmastangent screw tangent screw n. a screw working tangentially upon a toothed circle or arc so as to give it a slow motion for delicate measurements or adjustments. ΘΚΠ the world > relative properties > measurement > measuring instrument > [noun] > graduated instruments > graduated scale > movable scale or vernier > adjustment screw tangent screw1862 1862 Internat. Exhib.: Illustr. Catal. Industr. Dept. II. xiii. 5/2 Circumferenter or miner's dial, with tangent screw adjustment. 1877 E. H. Knight Pract. Dict. Mech. Tangent-screw, an endless screw tangentially attached to the index-arm of an instrument of precision, enabling a delicate motion to be given to the arm after it has been clamped to the limb, and permitting angular measurements to be made with greater exactness than could be done were the movement entirely effected by hand. < as lemmas |
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