Abstract
Through cooperation among the Bell Telephone Laboratories, the National Bureau of Standards, and the Electro-Acoustic Laboratory at Harvard University, the technique of obtaining absolute pressure calibrations of condenser microphones by the reciprocity method has been perfected and standardized to a gratifying degree of accuracy. Numerical data are given for a Western Electric Type 640-AA instrument which was calibrated at the three laboratories in succession, showing the accuracy to be expected at the present state of the art.
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