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Joseph von Fraunhofer and the Solar Spectrum

Joseph von Fraunhofer and the Solar Spectrum

Harald Sack
On March 6, 1787, German optician and physicist Joseph Fraunhofer – later enobled Ritter von Fraunhofer – was born. He is known for the discovery of the dark absorption lines known as Fraunhofer lines in the Sun‘s spectrum, and for making excellent optical glass and achromatic telescope objectives. Moreover, he is the name giver for the German Fraunhofer Society for the advancement of applied research. “In all my experiments I could, owing to…
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engineering
Ernst Abbe – Brilliant Engineer and Courageous Social Reformer

Ernst Abbe – Brilliant Engineer and Courageous Social Reformer

Tabea Tietz
On January 23, 1840, German physicist, optometrist, entrepreneur, and social reformer Ernst Abbe was born. Together with Otto Schott and Carl Zeiss, he laid the foundation of modern optics. As a co-owner of Carl Zeiss AG, a German manufacturer of research microscopes, astronomical telescopes, planetariums and other optical systems, Abbe developed numerous optical instruments. “Whatever entrepreneurial income is received shall be returned to the public, it does not belong to those who…
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physics
Leon Foucault demonstrating the Effect of the Earth’s Rotation

Leon Foucault demonstrating the Effect of the Earth’s Rotation

Harald Sack
On January 3, 1851, French physicist Leon Foucault started to experiment with his eponymous pendulum, by which he was able to prove the earth‘s rotation. Actually, how can you prove that the earth is a rotating orb in an easy-to-see experiment and – of course – without spaceflight? By today, Foucault’s simple device is part of numerous natural science museums around the world. The Pendulum Ok, how does Foucault’s pendulum work? The apparatus consists of a…
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