John Frederic DaniellBorn 12 Mar 1790; died 13 Mar 1845 at age 55.British chemist and meteorologist who invented the Daniell cell, which was a great improvement over the voltaic cell used in the early days of battery development. His research in1820 led to the invention of a dew-point hygrometer that measured relative humidity which afterwards became a standard instrument. Daniell began experiments in 1835 in an attempt to improve the Voltaic battery with its problem of being unsteady and as a weak source of electrical current. In 1836, he invented a primary cell in which hydrogen was eliminated in the generation of the electricity. Daniell had solved the problem of polarization due to the was a thin film of hydrogen bubbles that formed over the positive electrode that reduced current. |
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