| 单词 | pump-bob |
| 释义 | > as lemmaspump-bob pump-bob n. now rare a mechanism for converting rotary motion into linear motion suitable for operating a pump. ΚΠ 1872 Rep. Comm. Sutro Tunnel 49 The excavations for and the construction of pump-bobs. 1882 Weekly Nevada State Jrnl. 21 Jan. 4/4 Nearly 200 persons visited the Reno Foundry Sunday afternoon to witness the casting of a fifteen ton pump-bob. 1960 Dict. Mech. Engin. (ed. 8) ii. 270 Pump bob, a bell crank, or rocking lever which converts rotary into reciprocal motion. < as lemmas |
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