A giant amplifier exaggerates the sound of a falling feather millions of times over. London.
Fall of a feather.
M/S of recording equipment, a man walks up and adjusts the giant amplifier. C/U's of various parts of the machine including milliamperes dial. M/S of engineers listening in to amplifier and tuning into cathode-ray tube in oscilloscope. They demonstrate by dropping a feather beside a microphone and recording the noise that it makes. C/U of radar showing on tube. The noise sounds like a giant explosion.