A shell of a magnetic rod is disclosed, which wraps a permanent magnet rod, and the outer surface of the shell is provided with a plurality of concave grooves.

公开了一种磁力棒的外壳，其裹在永磁体棒外面，所述外壳的外表面设有若干凹槽。

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The method includes: detecting magnetic induction of the magnet via the sensor to judge relative position of the magnetic rod and the measuring rod;

所述方法包括：通过 所述传感器检测所述磁铁的磁感应强度，判断出所述磁力杆和所述测量杆的相对位置；

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As a no-rust, non-pitting tube it is superb, yet it brings even further benefit: We can fit the piston with a magnet and operate tie-rod mounted limit switches - a unique feature!

作为无锈、无蚀管，它的性能是一流的，同时也带来了另一个好处。我们可以放置一个磁铁在活塞处，操作拉杆有限开关——这是一个独特的功能！

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After Googling "lost keys down sewer" to see what tactics others had used, Mr. Burks thought he could recover his keys with a fishing rod and a magnet, but had neither.

WSJ: Websites Let People Farm Out Chores

Every kid who watched Mr. Wizard (myself included) learned how to make a strong magnet with some wire, a battery, and an iron rod.

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