Resultate aus den Beobachtungen des Magnetischen Vereins im Jahre Bd. 2 (1837), c. 3

66. Terrestrial Magnetism This work is the result of the first worldwide survey of the Earth's magnetic field. Part of the achievement of this research was the construction of the first electric telegraph line.
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66. Terrestrial Magnetism

This work is the result of the first worldwide survey of the Earth's magnetic field. Part of the achievement of this research was the construction of the first electric telegraph line.