Science: Quicker Than the Ear

Working with some unusual accessories (including canary birds, guppies and nervous women), Inventor S. Young White is digging into a complex study called ultrasonics.* Last week, in Audio Engineering, Inventor White described one of his gadgets: a sound-maker no bigger than a milk bottle. The White siren can generate: 1) "silent" sounds powerful enough to set paper afire; 2) audible sounds so loud that they knock strong men (including Mr. White) silly for five minutes.

Mr. White's doomsday trumpet is a steel wheel 3½ inches in diameter, with 80 square teeth around its edge. It spins against a thick steel disc drilled...

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