San Francisco : Architect and Engineer, Inc · leaf 211
10 JtO JO -to so 60 70 eo 90Lou<int6S 204-8 dv ^0 M 40 JO 60 70 60 90Loudnttt ^096 dv. … 10 10 X 40 SO 60 Loudne Si 70 eo 90 /O Zo iO 40 so 60 70 00 90Loudness \ FIG. 1 Inierfering Tones of Constant Loudness
Architecture · Building
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