Franz Melde

Franz Emil reporting ( born March 11, 1832 † March 17, 1901 ) was a German physicist and professor at the University of Marburg. Reporting was there in 1864 the successor of Christian Ludwig Gerling. In his time, the university experienced by their belonging to Prussia a major boom. He built from the physical placement and engaged in fluid mechanics, meteorology and acoustics. Reporting was a practicing musician and examined the Chladni figures of musical instruments, measured tones of very high frequency and discovered in his work on vibrating strings, the principle of parametric amplifier ( an amplifier in which the input signal is periodically changed a component ( parameters) of the oscillating system ). To this end, he coupled a tuning fork on a vibrating string, which oscillated at twice the resonant frequency of the string. For his measuring equipment he received, inter alia, a silver medal at the World Exhibition in Chicago in 1893.

He was known especially for an experiment to demonstrate standing waves, which was named in his honor. This experiment allows the determination of the pattern of a standing wave and measuring the speed of a transverse wave on a string and provides insights to the interference of mechanical waves.