A text-book of physics, largely experimentalOn the Harvard college "Descriptive list of elementary physical experiments." . FIG. 238. The process of magnetization can be helped on by tapping the barsmartly with a heavy stick while it is in the vertical show this, hold one end of the vertical bar at such a distancefrom the needle as to produce a rather small deflection before thebar is struck, and then note the increase of deflection produced bythe striking.* * When a magnet is under the influence of forces tending to demag-netize it, jarring promotes demagnetization. MAGNETISM. 433
A text-book of physics, largely experimentalOn the Harvard college "Descriptive list of elementary physical experiments." . FIG. 238. The process of magnetization can be helped on by tapping the barsmartly with a heavy stick while it is in the vertical show this, hold one end of the vertical bar at such a distancefrom the needle as to produce a rather small deflection before thebar is struck, and then note the increase of deflection produced bythe striking.* * When a magnet is under the influence of forces tending to demag-netize it, jarring promotes demagnetization. MAGNETISM. 433 346. Poles of Ordinary Magnets ; Magnetic Repulsion. — If one takes an ordinary bar-magnet and presents differ-ent parts of it in turn to one end of a magnetic needle, itwill be found that the ends have much more effect than themiddle. As in the case of the earth we speak of two mag-netic poles from which the magnetic influences appear tocome, so in the case of the bar-magnet we call the tworegions, usually near the ends, in which the peculiar powerof the magnet seems to lie, the poles of the magnet. If we present
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectphysics
