A large 1-m diameter rotary table with a semicircu-lar waveguide along its periphery is the basis of the Doppler frequency shift of sound apparatus. A "button" speaker is attached to the outer edge of the rotary table and a microphone pickup is positioned on the wall of the wave-guide at its midpoint. At approximate speeds of 25 mph (11 m/s), the velocity measured from the frequency shift between the approaching and receding speaker compared to the velocity measured from the repeat sound pattern agree to within 1%. The microphone output is fed successively to our 10 computer stations.
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机译：直径为1 m的大旋转工作台，沿其外围有半圆波导，是音响设备的多普勒频移的基础。 “按钮”扬声器连接到旋转台的外边缘，麦克风拾音器位于波导壁的中点。在大约25 mph（11 m / s）的速度下，从接近和后退扬声器之间的频移测得的速度与从重复声音模式测得的速度相比，在1％之内。麦克风输出被连续馈送到我们的10个计算机站。
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