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Valentine Dudley Evans
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Publication of GB191200335ApublicationCriticalpatent/GB191200335A/en
H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
H04R21/00—Variable-resistance transducers
H04R21/02—Microphones
H04R21/021—Microphones with granular resistance material
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Engineering & Computer Science
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Acoustics & Sound
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Signal Processing
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Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers
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Abstract
335. Evans, V. D. Jan. 4. M i c r o p h o n e s. - T h e electrode b of a carbonshot microphone is so arranged that the points of contact with the diaphragm of the groups of carbon-shot c, and also the mass-centres c<1> of these, are equidistant from the centre of the diaphragm d'. The screw f is eccentrically placed with respect either to the support g or to the electrode b. The recesses for the shot are preferably formed with cylindrical faces a<1> adjoining _partly conical, conoidal, or spherical faces a<2>.
GB191200335D1912-01-041912-01-04Improvements in Microphones.
ExpiredGB191200335A
(en)