Signedon instrument: RUDOLPH KOENIG / À PARIS
FunctionApparatus to show the difference of phase between the transmitted and the received sound in the telephone transmission. To make this experiment one needed two of these apparatus. The electromagnet would have been linked together. When one of the tuning forks was made to vibrate, it induced in the other fork, via copper wires, a vibration that was in a different phase with the original one. This phase difference corresponded perfectly to Emil Dubois-Reymond's theory of transmission.
Primary SourcesRudolph Koenig, Catalogue des appareils d'acoustique construits par Rudolph Koenig (Paris, 1889), 59, no. 167 and 167a.
Related WorksDavid Pantalony, Rudolph Koening (1832-1901), Hermann von Helmholtz (1821-1894) and the Birth of Modern Acoutsics, unpublished dissertation, University of Toronto, 2002.
David Pantalony, "Rudolph Koenig's Workshop of Sound: Instruments, Theories, and the Debate over Combination Tones," Annals of Science 62 (2005): 57-82.
Thomas Greenslade, "The Acoustical Apparatus of Rudolph Koenig," The Physics Teacher, 30 (December, 1992).