A NEW silencer now being used by Northrop Aircraft, Inc., in ground testing jet engines at Hawthorne, California, attenuates sound waves from an intensity of 148 to 108 db. at a point 100 feet away from their source.
Dickinson, T. (1955), "An American Ground Test Silencer: Particulars of a Modern Jet Engine Silencer at Northrop Aircraft", Aircraft Engineering and Aerospace Technology, Vol. 27 No. 5, pp. 165-165. https://doi.org/10.1108/eb032554Download as .RIS
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