Hermann von Helmholtz has studied the phenomena…
1871 CE
Hermann von Helmholtz has studied the phenomena of electrical oscillations from 1869 to 1871, and in a lecture delivered to the Nat. Hist. Med. Ver. at Heidelberg on April 30, 1869, titled On Electrical Oscillations had indicated that the perceptible damped electrical oscillations in a coil joined up with a Leyden jar were about 1/50th of a second in duration.
In 1871, he announces that the velocity of the propagation of electromagnetic induction is about 314,000 meters per second.
In this year, Helmholtz moves from the University of Heidelberg, where he is a professor of physiology, to the University of Berlin to become a professor in physics.
He becomes interested in electromagnetism and the Helmholtz equation is named for him.
Although he does not make major contributions to this field, his student Heinrich Hertz will became famous as the first to demonstrate electromagnetic radiation.
Oliver Heaviside criticizes Helmholtz's electromagnetic theory because it allows the existence of longitudinal waves.
Based on work on Maxwell's equations, Heaviside pronounces that longitudinal waves could not exist in a vacuum or a homogeneous medium.
Heaviside does not note, however, that longitudinal electromagnetic waves can exist at a boundary or in an enclosed space.
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