Electromagnetic log

An Electromagnetic Log, sometimes called an "EM Log", measures the speed of a vessel through water.

It operates on the principle that: 1 when a conductor (such as water) passes through an electromagnetic field, a voltage is created and 2 the amount of voltage created increases as the speed of the conductor increases.

单词	Electromagnetic Log
释义	Electromagnetic Log 英语百科 Electromagnetic log An Electromagnetic Log, sometimes called an "EM Log", measures the speed of a vessel through water. It operates on the principle that: 1 when a conductor (such as water) passes through an electromagnetic field, a voltage is created and 2 the amount of voltage created increases as the speed of the conductor increases.
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