. Practical physics. Andre Marie Ampere (1775-1836) French physicist and mathematician; son of one of the victimsof the guillotine in 1793; professor at the Polytechnic School inParis and later at the College of France; hegan his experimentson electromagnetism in 1820, very soon after Oersteds discovery;published his great memoir on the magnetic effects of currentsin 1823; first stated the rule for the relation between the directionof a current in a wire and the direction of the magnetic fieldabout it. The ampere, the practical unit of current, is namedin his honor. High Rotou The fi«;nre show
. Practical physics. Andre Marie Ampere (1775-1836) French physicist and mathematician; son of one of the victimsof the guillotine in 1793; professor at the Polytechnic School inParis and later at the College of France; hegan his experimentson electromagnetism in 1820, very soon after Oersteds discovery;published his great memoir on the magnetic effects of currentsin 1823; first stated the rule for the relation between the directionof a current in a wire and the direction of the magnetic fieldabout it. The ampere, the practical unit of current, is namedin his honor. High Rotou The fi«;nre shows, in process of construction, one of the most recent types of hugegenerator of electricity, wliicii are the outgrowtli of the discovery of the rehitionbetween magnetism and electricity to which Ampere contrihuted so much. Thefigure shows in place one of the rotating electromagnets, which, as they swingpast the huge coils of the stator surrounding them, at a peripheral speed of a mileand a half a minute, generate a current of -TOO amperes at 12,0(10 volts. This isone of the three 32,500-kilowatt machines built for installation at Niagara Falls MEASUREMENT OF ELECTRIC CURRENTS 257
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysics, bookyear1922
