1955 NACA microphone actuator - photo

[Altair]

NACA microphone actuator at the Lewis Flight Propulsion Laboratory (now Glenn Research Center), c. 1955. Full caption: "MICROPHONE ACTUATOR ON HANGAR APRON"

Fullsize image: https://diqn32j8nouaz.cloudfront.net...r_fullsize.jpg



Previously:

1956 NACA metallurgical services worker - photo
1956 NACA wind tunnel wall jacks - photo
1952 NACA heat transfer test section and rig - photo
1951 NACA 20-inch compressor in lathe - photo
1954 NASA chemist - photo
Constructing NACA's wind tunnel propellers - GIF

[jdurand]

well, that should trigger any microphone at a range of possible miles.