. Laboratory exercises in elementary physics. if the attracted body also attracts themagnet. Manipulation.—Make a smallstirrup of wire (copper is thebest), as in Fig. 2, and by meansof it suspend the magnet so thatit swings freely and hangs hori-zontally. When it has come torest, bring a large nail near oneend, but not touching it. Ob-serve carefully what happens, andrecord. Now repeat with the other end of the magnet. Noticeparticularly whether the results are the same for both ends. EXPERIMENT 2. Object.—To see what happens when a magnet is freeto move in a horizontal plane. Manipulation.—Se


. Laboratory exercises in elementary physics. if the attracted body also attracts themagnet. Manipulation.—Make a smallstirrup of wire (copper is thebest), as in Fig. 2, and by meansof it suspend the magnet so thatit swings freely and hangs hori-zontally. When it has come torest, bring a large nail near oneend, but not touching it. Ob-serve carefully what happens, andrecord. Now repeat with the other end of the magnet. Noticeparticularly whether the results are the same for both ends. EXPERIMENT 2. Object.—To see what happens when a magnet is freeto move in a horizontal plane. Manipulation.—Set the suspended magnet to swinginggently. Note if it tends to come to rest in any particulardirection, and if so in what direction. If there is anydoubt, after the magnet has come to rest displace it slightlyand see if it shows any tendency to return to that any particular end of the magnet tend to point in anyparticular direction? * If a compass is available, it may be conveniently substitutedfor the suspended 6 MAGNETISM. Definitions.—If something happens to one substancewhen another substance is brought near it, the second issaid to act on the first. If the action is mutual, eitherbody may be said to act and the other would then be saidto react. Does a magnet act on a piece of iron ? Is thereany reaction ? If so, where ? The pole of a magnet that tends to point north is calledthe North-seeking or North pole. In the same way theother is called the South pole. When new properties are developed in one body by bring-ing another body near it, the new properties of the firstbody are said to be induced by the second. Any contrivance for getting desired conditions is calleda piece of apparatus; for instance, a compass is a contrivanceor piece of apparatus for arranging a magnet so that it canswing freely. When the same experiment has been tried a great manytimes, with the same results wherever or whenever it wastried, such results are said to be a law.


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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectphysics