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Radio Record, 29 April 1938, Page 42

RUILDERS of cathedral organs and other acoustic experts have long known that powerful sound waves can set up considerable strains, even in well-built structures. It is generally the deep bass notes that cause strain and cracking, but there have heen suggestions that the fall of the walls of Biblical Jericho was am acoustic effect due to the trumpets. American public address engineers have now been measuring the effect on various buildings of very powerfully amplified music and they have found that it is possible to cause vibrations of walls, floors; ete., even when they are set in conerete.