San Francisco : Architect and Engineer, Inc · leaf 211
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 … 6^ iZd ^S6 sii toz^ j:o4d 4os6 di$^ Fre(fuencij d.v. per sec. lie;. II SEPTEMBER, 1926 71 1 100 60 * i 60 .0 ^£0 \ *^ z—— 1 ^ 1 —-- •-,,,,,^^^^ •> ^^-^ **•.- *N ***^^ 1 onant L0Jt>5 k n: 6Lflk o -20 -4-0 60 00 Loudness of fioise.- 6.U. these tests, approximately 47 S. U., is indicated by a…
Architecture · Building
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