Show beat of heart breaks silence e in dead room MURRAY HILL N J A dead room which is so quiet that a pin drop can be heard before the pin hits the floor has been created here even the beat ol 01 a heart will break brea 11 dead silence in the laboratory de signed by bell telephone labora tones tories lor for sound experimentation A watch tick sounds like a riveting ma chine in order to kill the noise which ordinarily would come from air con equipment engineers of bell and minneapolis honeywell regulator company designed an elaborate control system outside air passes through a labyrinth lan tunnel which traps sound in sharp corners if these precautions were not tak en even the air waves would create a nol noise se comparable to rolls of thun der outside |