If we look back on this day in history, it marks the birth anniversary of Wilhelm Eduard Weber. He was a German physicist born on 24th October 1804 who together with Carl Friedrich Gauss studied terrestrial magnetism and invented the first electromagnetic telegraph.
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| A portrait of Wilhelm Eduard Weber. Source: Wikipedia |
He developed a number of magnetic maps with his colleagues. Thanks to this, there are now magnetic observatories all over the globe that measure the magnetic field on the surface. These observations are used by scientists to make models of the Earth's magnetic field originating from different sources. They are also important in estimating magnetic indices that provide an indication of the solar disturbances.
The first usage of the letter c was done in Kohlrausch and Weber (1856) to denote a number very close to the speed of light. In his honour, Weber (Wb) is the unit of magnetic flux in the SI units (International System of Units).
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