Franz Melde
Franz Emil Melde (born March 11, 1832 in Großenlüder near Fulda, † March 17, 1901 in Marburg ) was a German physicist and professor at the Philipps University of Marburg . Melde was there from 1864 the successor of Christian Ludwig Gerling . In his time the university experienced a great boom after it belonged to Prussia. He expanded the physical internship and dealt with fluid dynamics, meteorology and acoustics. Melde was a practicing musician and studied the Chladnian sound figures of musical instruments, measured tones of very high frequency and discovered the principle of the parametric amplifier (an amplifier in which the input signal periodically changes a component (parameter) of the vibrating system) while working on vibrating strings . To do this, he coupled a tuning fork to a vibrating string that oscillated at twice the resonance frequency of the string. For his measuring equipment he received a. a. a silver medal at the Chicago World's Fair in 1893 .
He was best known for an experiment to demonstrate standing waves , which was named after him in his honor. This experiment enables the determination of the pattern of a standing wave as well as the measurement of the speed of a transverse wave on a thread and provides information on the interference of mechanical waves.
In 1885 he was elected a member of the Leopoldina .
literature
- Message: acoustics . Leipzig, Brockhaus 1883
- Birt: Marburg light and shadow images . Marburg 1927
- C. Graepler: Imagines Professorum Academiae Marburgensis . Marburg 1977
- Poggendorff: Biographical literary concise dictionary of the exact natural sciences . Vol. 7 a, Supplement
- Bernd Heinzmann: Melde, Franz. In: New German Biography (NDB). Volume 17, Duncker & Humblot, Berlin 1994, ISBN 3-428-00198-2 , p. 13 f. ( Digitized version ).
Web links
- History of Physics at the University of Marburg, PDF file
- The theory of the vibration curves according to external and own investigations , text volume, 1864, e-book of the University Library Vienna ( e-books on demand )
- The teaching of the vibration curves according to external and own investigations , Atlas, 1864, e-book of the University Library Vienna ( e-books on demand )
swell
- ↑ see Hessisches Staatsarchiv Marburg (HStAMR), Best. 915 No. 5690, p. 122 ( digitized version ).
- ↑ Report "About the excitation of standing waves of a thread-like body", Poggendorffs Annalen der Physik und Chemie (Series 2), Vol. 109, 1859, pp. 193-215
| personal data | |
|---|---|
| SURNAME | Report, Franz |
| ALTERNATIVE NAMES | Report, Franz Emil |
| BRIEF DESCRIPTION | German physicist |
| DATE OF BIRTH | March 11, 1832 |
| PLACE OF BIRTH | Grossenlüder , Fulda |
| DATE OF DEATH | March 17, 1901 |
| Place of death | Marburg |