The New Encyclopaedia Britannica: Macropaedia: knowledge in depth. 19 vEncyclopaedia Britannica, Incorporated, 1981 - Encyclopedias and dictionaries |
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Page 54
The decibel sound rati Tolerable noise levels Sound- absorbing materials Dead and live rooms A Sound mirror. E.P. SERJEANT , Ionization Constants of Acids and Bases , 2nd ed . ( 1970 ) , a laboratory manual containing tables of ioniza ...
The decibel sound rati Tolerable noise levels Sound- absorbing materials Dead and live rooms A Sound mirror. E.P. SERJEANT , Ionization Constants of Acids and Bases , 2nd ed . ( 1970 ) , a laboratory manual containing tables of ioniza ...
Page 55
... sound energy can dissipate , thus losing energy in the form of heat . Sound energy so dissipated is never re- covered as sound . Because it is essential that the inter- stices of sound - absorbing materials be intercommunicat- ing , a ...
... sound energy can dissipate , thus losing energy in the form of heat . Sound energy so dissipated is never re- covered as sound . Because it is essential that the inter- stices of sound - absorbing materials be intercommunicat- ing , a ...
Page 56
... sounds to be heard must have adequate loudness , there must be a good distribution of sound , and the sounds must be properly blended , with adequate separation for good ar- ticulation of music or speech . Absence of noise . Perhaps the ...
... sounds to be heard must have adequate loudness , there must be a good distribution of sound , and the sounds must be properly blended , with adequate separation for good ar- ticulation of music or speech . Absence of noise . Perhaps the ...
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