 | Thomas Dixon Lockwood - 1883 - 404 стор.
...The earth is itself a magnet, and has north and south magnetic poles. The pole which in any magnet points to the north is called the north pole, and the other is called the south pole. Any two north poles repel each other, as do also any two south poles ; but... | |
 | Elias Hudson Bartley - 1889 - 456 стор.
...mounted above a dial, marked with the "points of the compass." The end of the needle or magnet that points to the north is called the north pole, and the other the south pole. If a magnet be broken at any point between the two poles, each of the pieces becomes... | |
 | Elias Hudson Bartley - 1898 - 780 стор.
...mounted above a dial, marked with the " points of the compass." The end of the needle or magnet that points to the north is called the north pole, and the other the south pole. If a magnet be broken at any point between the two poles, each of the pieces becomes... | |
 | Dugald Caleb Jackson - 1902 - 514 стор.
...small elongated magnet thus suspended is called a Magnetic Needle (Fig. 34). If a magnetic needle is turned from the direction which it naturally takes...horizontally, but Dip Needles are sometimes constructed by mounting magnetic needles on horizontal pivots (Fig. 35). When a dip needle is turned north and... | |
 | Elias Hudson Bartley - 1906 - 760 стор.
...mounted above a dial, marked with the " points of the compass." The end of the needle or magnet that points to the north is called the north pole, and the other the south pole. If a magnet be broken at any point between the two poles, each of the pieces becomes... | |
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Such a needle always arranges itself nearly due north and south, and always in the same position. The compass sold by opticians is simply such a needle mounted above a dial, marked with the " points of the compass." The end of the needle or magnet that... 