. Practical physics. tead of tlie singlecell. If, however, the plates A and B are three or four inches in diameter,,and if tlieir surfaces are very flat, a single cell is .sufficient. Hans Christian Oersted ? /I mSM WL (1777-1851) 9 ^^ The discoverer of the connection between electricity and niagnetlsui ^R A jji was a Dane and a professor at the *^m ;|^^ University of Copenhagen. His •^^L. ^-^K^Ki famous experiment made in 1S20 niMHIlltfiHHi stimulated the researches whichled to the modern industrial devel- HI opments of electricity Joseph Henry (1797-1878) Born in Albany, Kew York ; taught 1
. Practical physics. tead of tlie singlecell. If, however, the plates A and B are three or four inches in diameter,,and if tlieir surfaces are very flat, a single cell is .sufficient. Hans Christian Oersted ? /I mSM WL (1777-1851) 9 ^^ The discoverer of the connection between electricity and niagnetlsui ^R A jji was a Dane and a professor at the *^m ;|^^ University of Copenhagen. His •^^L. ^-^K^Ki famous experiment made in 1S20 niMHIlltfiHHi stimulated the researches whichled to the modern industrial devel- HI opments of electricity Joseph Henry (1797-1878) Born in Albany, Kew York ; taught 1 ihysics and mathematics in Albany m Academy and Princeton invented the electromagnet(1828), discovered the oscillatory ™fi nature of the electric spark (1842)by magnetizing needles in the iiiMilWirir^Tmfii manner described on page 244, and hIh| made the first experiments in self-induction (1832). He was the firstsecretary of the Smithsonian Insti-tution, and the organizer of the ^^^^Hr Weather Bureau. V AL IE I0 271
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysics, bookyear1922
