Joseph von Fraunhofer, spectroscope, 1814
Bildnummer 13501593
| Fraunhofer demonstrating his invention, the spectroscope. Joseph Ritter von Fraunhofer (March 6, 1787 - June 7, 1826) was a German physicist. One of the most difficult operations of practical optics was to polish the spherical surfaces of large object glasses accurately. Fraunhofer invented a machine which rendered the surface more accurately than traditional grinding. in 1814, he invented the spectroscope. In the course of his experiments he discovered the bright fixed line which appears in the orange colour of the spectrum when it is produced by the light of fire. This line enabled him afterward to determine the absolute power of refraction in different substances. Experiments to ascertain whether the solar spectrum contained the same bright line in the orange as that produced by the light of fire led him to the discovery of 574 dark fixed lines in the solar spectrum. These lines are called Fraunhofer lines in his honour. Like many glassmakers of his era who were poisoned by heavy metal vapours, Fraunhofer died young, in 1826 at the age of 39. His most valuable glassmaking recipes are thought to have gone to the grave with him. Photogravure from a painting by Richard Wimmer. | |
| Lizenzart: | Lizenzpflichtig |
| Credit: | Science Photo Library / Omikron |
| Bildgröße: | 3276 px × 2550 px |
| Modell-Rechte: | nicht erforderlich |
| Eigentums-Rechte: | nicht erforderlich |
| Restrictions: | - |
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