| 单词 | pendulum seismograph |
| 释义 | pendulum seismograph [`pen·jǝ·lǝm `sīz·mǝ´graf] ENGINEERING A seismograph that measures the relative motion between the ground and a loosely coupled inertial mass; in some instruments, optical magnification is used whereas others exploit electromagnetic transducers, photocells, galvanometers, and electronic amplifiers to achieve higher magnification. |
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