A text-book on chemistryFor the use of schools and colleges . wire be made to move ? Describea method of showing rotation of a wire round the pole of a is the nature of the force exerted between a conducting wireand a magnet? Describe the construction and properties of astraight electro-magnet. Describe the horse-shoe electro-magnet. THE TELEGRAPH. 175 may be made to give rise to very striking Henry, by a modification of Fig% 14Tthe conducting wire, succeeded in im-parting so intense a degree of magnet-ism to a piece of soft iron that it couldsupport more than a t
A text-book on chemistryFor the use of schools and colleges . wire be made to move ? Describea method of showing rotation of a wire round the pole of a is the nature of the force exerted between a conducting wireand a magnet? Describe the construction and properties of astraight electro-magnet. Describe the horse-shoe electro-magnet. THE TELEGRAPH. 175 may be made to give rise to very striking Henry, by a modification of Fig% 14Tthe conducting wire, succeeded in im-parting so intense a degree of magnet-ism to a piece of soft iron that it couldsupport more than a ton weight. If un-der one of these Electro-Magnets adishful of small iron nails be held, themoment the current passes the nails areall attracted, and, while they are held byits poles, may be moulded by the handin various shapes, but as soon as the cur-rent stops they all fall off. It is upon this principle of producingtemporary magnetism by an electric cur-rent that Morses electric telegraph de-pends. In Fig. 148, m m is an electro-magnet, with its Fig.
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