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1849 – Klein – bio
Felix Christian Klein was born in Dusseldorf, Germany and was a mathematician. He did work on group theory and non-Euclidian geometry. He wrote a book on the icosahedron and created a 4-dimensional construct that is known as the “klein bottle”. PRECURSOR: Plucker 1826 – Riemann CONCURRENT: 1842 – Lie 1844 – Boltzmann 1854 – Poincare […]
1855 – vacuum tube
Heinrich Geissler and Julius Plucker use Geisslers new mercury vacuum pump to evacuate the atomosphere inside a glass tube. Plucker, a young professor at the University of Bonn, discovered that a glowing stream could be produced when electricity was passed through electrodes embedded in the glass tubes and that the stream responded to a magnet. […]
