| 单词 | sprung-under |
| 释义 | > as lemmassprung-under C1. Watchmaking. With adverbs, in †sprung-above (obsolete rare), sprung-over: designating a watch in which the balance spring is positioned above the balance. Also in sprung-under (now rare): designating a watch in which the balance spring is positioned below the balance. ΚΠ 1869 Eng. Mechanic 22 Jan. 404/2 Even in ‘sprung-over’ watches the stud is made of steel, and often so narrow at the end that the pin cannot hold in firm. 1877 Horological Jrnl. Apr. 103/2 Make a piece of brass wire into the form of the stud of a sprung under watch. 1884 F. J. Britten Watch & Clockmakers' Handbk. (new ed.) 246 Sprung Over [or] Sprung Above, a watch in which the balance spring is attached to the staff above the balance. 1944 Jewelers' Circular-Keystone May 146/3 Sprung-over, arrangement in designing watches in which the hair-spring lies above the balance arms; differentiated from sprung-under watches with hairsprings located under the balance arms. 2000 National Assoc. Watch & Clock Collectors Bull. Feb. 88/2 The movement has a cut expansion balance, Breguet hairspring, and plain sprung-over regulator. < as lemmas |
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