Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . eing a strong attraction between eachpole of the magnet and the correspond-ing extremity of the armature, that is,corresponding in position ; for the polar-ity of the parts in contact will evidentlybe of opposite denominations. If a barof iron is placed between the north polesof two magnets, both extremities be-come south poles, while a north pole isdeveloped at the middle of the bar. 229. Rolling Armature.—Thisapparatus consists of a horseshoemagnet
Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . eing a strong attraction between eachpole of the magnet and the correspond-ing extremity of the armature, that is,corresponding in position ; for the polar-ity of the parts in contact will evidentlybe of opposite denominations. If a barof iron is placed between the north polesof two magnets, both extremities be-come south poles, while a north pole isdeveloped at the middle of the bar. 229. Rolling Armature.—Thisapparatus consists of a horseshoemagnet and an iron wire or rod,whose length is. a little greater thanthe breadth of the magnet. Tothe middle of the wire a small fly-wheel is attached. This armatureis placed across the magnet, at somedistance from the poles, and themagnet held in such a position,with the poles downward, that thearmature may roll towards it reaches the poles, themagnetic attraction of the iron axisprevents its falling off, while themomentum acquired by the fly-wheel carries it for-ward, causing it to roll some distance up the otherside of the MAGNET AND ROLLER. 145
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmagnetism, bookyear18
