The magnetic survey instrument is similar to the tool used in a single-shot survey except that camera is a modified movie camera that takes pictures every 15-20 seconds.
磁性测量仪器与单点测量所用的下井仪类似，不过它使用的摄影机是一种改造过的电影摄影机。每15~20秒钟可以照相一次。
The magnetic survey instrument is similar to the tool used in a single-shot survey except that camera is a modified movie camera that takes pictures every 15-20 seconds.
磁性测量仪器与单点测量所用的下井仪类似，不过它使用的摄影机是一种改造过的电影摄影机。每15~20秒钟可以照相一次。
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