San Francisco : Architect and Engineer, Inc · leaf 415
viation Manufacturing Corporation,and (4) a Pullman parlor on a Pennsylvania Rail-road train. Low Frequencies More IntenseThe chart shows that in each of the four ve-hicles, the low frequency sources of noise aremuch more intense than the high frequencysources. In the cases of the air-liner and… … THE ARCHITECT AND ENGINEER •^ 54 ^ SEPTEMBER, NINETEEN THIRTY-FOUR In the cases of the street car and bus. the in-tensity curves, although higher in value, followa pattern similar to those of the airliner and Pull-man with a downward slope through the low andmedium frequencies, but where the curves…
Architecture · Building
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