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abscissas acoustical properties adjusted alternating current alternating-current amplifier binding post building materials calibration curve CHARACTERISTICS OF APPARATUS chosen galvanometer deflection circuit coil setting comparator scale comparison connected constant deflection is obtained described DESCRIPTION OF APPARATUS desired detector device diameter Eckhardt electrostatic transmitter emf Eb FEATURES WHICH ENTER flake formulas frequency galva graduated guide grid Hewlett high sensitivity induced intensity is deter Karcher laboratory loud speaker Magnavox magneto magnetophone measurement of absolute Measurement of Sound measuring apparatus measuring instrument method molybdenite mutual coupling mutual inductance nometer observer oscil output percentage of error phone Phys plotted precision of measurement presence Prof properties of building proportional range Rayleigh rectifier relative intensities relative sound intensity relative value resulting percentage sensitive galvanometer series of measurements small coil solder sound chamber sound field sound producer sound source sound-measuring apparatus substitution telephone receiver thermocouple tive tubes vacuum tube vacuum-tube voltage W. C. Sabine wires