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on Mar 10, 2011
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German-born physicist Hans Geiger invented a hand held machine used to detect radiation in the air.
William Thomson a physicist made the Kelvin scale.
Anders Celsius made measurement of temperature in 1742
Christian Huygens a dutch Physicist created Pendulumsin 1656
Evangelista Torricelli made vacuums
Gerardus Mercator created Atlas maps in 1569
It was built for an Arab sultan
Gerbert a french man created a mechanical clock in 999