?地磁感应罗盘

... 漏电侦检器 earth detector 地磁感应罗盘 earth induction compass 地磁感应器 earth inductor ...

?磁罗经

... 磁罗经 deviation table; earth induction compass; magnet compass; magnetic compass 电罗经 [航海学] gyro compass 吊罗经 hanging compass ...