San Francisco : Architect and Engineer, Inc · leaf 211
t, and its use inacoustic measurements is increasing. The loudness of a tone, expressed in this unit, is ten timesthe logarithm to the base ten of the ratio of the energy of the tone to the energy of a barelyaudible tone of the same pitch. For example, the standard tone in architectural acoustics,… … 10 JtO JO -to so 60 70 eo 90Lou<int6S 204-8 dv ^0 M 40 JO 60 70 60 90Loudnttt ^096 dv.
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