| 单词 | sinker-rod |
| 释义 | > as lemmassinker-rod sinker-rod n. now rare and historical a boring rod used to begin excavation of a well. ΚΠ 1875 E. H. Knight Amer. Mech. Dict. III. 2441/2 Substitute,..a short section of sinker-rod having flanges to ream the hole and keep it straight. 1947 R. P. Conkling & M. B. Conkling Butterfield Overland Mail 384 To the upper end of the sinker rod was attached a pair of iron shoes, or guides, having a play or stroke of sixteen inches. < as lemmas |
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