A manual of chemistry : containing a condensed view of the present state of the science, with copious references to more extensive treatises, original papers, &c: intended as a text-book for medical schools, colleges, and academies . se two, the motions which would takeplace if the wire were inverted, or the pole changed or made to move,may be readily ascertained, since the relation now pointed out remainsconstant. These motions are exhibited in an apparatus devised by Mr. Fara-day, or perhaps still better by the revolving cylinders of consist of a cylinder of copper b, about two i
A manual of chemistry : containing a condensed view of the present state of the science, with copious references to more extensive treatises, original papers, &c: intended as a text-book for medical schools, colleges, and academies . se two, the motions which would takeplace if the wire were inverted, or the pole changed or made to move,may be readily ascertained, since the relation now pointed out remainsconstant. These motions are exhibited in an apparatus devised by Mr. Fara-day, or perhaps still better by the revolving cylinders of consist of a cylinder of copper b, about two inches high, and oneand three fourths internal diameter, within which is a smaller cylinderabout one inch diameter a, also of copper. The two cylinders arefixed together by a bot-tom, having a hole inthe centre the size of thesmallest cylinder, leavinga circular cell which maybe filled with dilute piece of strong copperwire is fastened acrossthe top of the inner cyl-inder, with a point pro-jecting downward whichrests upon p, one of thepoles of a strong horseshoe magnet upon whichit can freely turn. A cyl-inder of zinc about aninch and a quarter in di-ameter and open at eachend with the wire c sol-dered at opposite sides. ELECTRO-MAGNETISM. 93 turns on the pivot <?. The cylinder of zinc hangs within the copper with-out touching it. If now diluted sulphuric or nitric acid be poured intothe cup b ihe zinc cylinder will revolve in one direction and the cop-per cup in a contrary direction. If the apparatus be placed upon theopposite pole of the magnet these motions wiil be reversed. II. Action of the conjunctive wire upon soft iron and steel.— It wasabout the same time ascertained, both by Sir H. Davy and M. Arago,that magnetism may be developed in steel, not previously possessingit, by being placed in the electric current, and may even be excited bythe connecting wire itself. Both philosophers ascertained, independ-ently of each other, that the conjunctive wire attracts
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