R. MAISONNEUVE, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY R. MAISONNEUVE, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY
Echo-free chamber. A scientist sets up an experiment to test radio antennae in an echo-free (anechoic) chamber. The foam pyramids covering the walls, floor and ceiling absorb radio waves, preventing any echoes that might confuse the test results. The radio antennae are the small pairs of pointed metal cones.
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