Elements of acoustical engineering (1940) Elements of acoustical engineering elementsofacoust00olso Year: 1940 206 MICROPHONES 5 VELOCITY \ UJ4 Z g a. V V \ \ \ I \ \ >Z < N y 1 FT. s^ s s? ft\^ -I tE 1 ^ l^ F T ^ AS 0 00 100 UNIDIRECTIONAL I FOOT FREQUENCY 100 FREQUENCY UNIDIRECTIONAL 2 FEET

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