U.S. Patent 1.333.744 Telephone-transmitter. Citat: "...Fig. 3' of the drawing, the diaphragm 6 and the plate 7 constitute the two plates 'of the condenser part of the transmitter. Sound waves, incident on the diaphragm, cause it to vibrate, thereby causing variations in the effective thickness of the dielectric between the plates and consequently giving rise to -variations in the capacity of the condenser..."
U.S. Patent 1.333.744 Telephone-transmitter. Citat: "...Fig. 3' of the drawing, the diaphragm 6 and the plate 7 constitute the two plates 'of the condenser part of the transmitter. Sound waves, incident on the diaphragm, cause it to vibrate, thereby causing variations in the effective thickness of the dielectric between the plates and consequently giving rise to -variations in the capacity of the condenser..."
aes.org: IN MEMORIAM (nekrolog) Citat: "...In 1928, Georg Neumann, together with Erich Rickmann, founded Georg Neumann & Co. in Berlin, and soon marketed the first commercially-produced condenser microphones..."
