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1/13 second interval accurate oscillogram acoustics audible Auditory Spectrum basilar membrane become inaudible become so faint center of disturbed cochlea components continuous fusion coordinates of displacement cycles a second disturbed equilibrium effect elastic fluid energy of vibration Energy-Frequency Ratios Equally Tempered equilib fact Fenestra Oralis fork whose frequency forward motions half period harmonic analysis hearing mechanism hysteresis less loud sensations loud and less loudness units Loudness varies mass occurring maximum resultant method minor actios movie-picture musical pitches n-component N-cycles n-period n-vibration Noise normal human brain operating overlapping loudness overlaps to 1/13 phenomena philology Pitch and Quality pitch sensation portion pressure per unit principles thus furnish produce sound sensation Professor Knipp psychology Purdue University reactio rhythmic succession sensational impulses slower slowest frequency sound wave succession of loud successive 1/13 successive maximum actios summation tectorial membrane term tion tube tuning-fork stimulus turbed upper limit vibrations a second whole mass yield