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Show Beat of Heart Breaks Silence in 'Dead Room' MURRAY HILL, N. J. A "dead room" which is so quiet that a pin-drop pin-drop can be heard before the pin hits the floor has been created here. Even the beat of a heart will break dead silence in the laboratory, designed de-signed by Bell Telephone laboratories labora-tories for sound experimentation. A watch-tick sounds like a riveting machine. ma-chine. In order to kill the noise which ordinarily would come from air conditioning con-ditioning equipment, engineers of Bell and Minneapolis - Honeywell Regulator company designed an elaborate control system. Outside air passes through a labyrinthian tunnel which traps sound in sharp corners. If these precautions were not taken, tak-en, even the air waves would create a noise comparable to rolls of thunder thun-der outside. |