ferromagnetic oscillograph

例句：

1. 1.The ferromagnetic oscillograph was used to measure the magnetic field strength.
   铁磁振荡器被用来测量磁场强度。
2. 2.The engineer used the ferromagnetic oscillograph to detect the fault in the power line.
   工程师使用铁磁振荡器来检测输电线上的故障。
3. 3.The ferromagnetic oscillograph was a revolutionary tool for measuring electrical signals.
   铁磁振荡器是测量电气信号的革命性工具。