NOISES WE CANNOT HEAR
Many of us at times complain of a friend’s piercing whistle, but unfortunately no boy can emulate the strange things accomplished by the high-frequency whistling described in a recent Journal of the Acoustical Society of America. These sounds, too high-pitched to be heard by the human ear, were produced by a small siren driven by a two-thirds horse-power highspeed motor. They could mice and cockroaches, light a pipeful. of tobacco without the use of a match, boil water, burn cotton, and lift coins, small balls, and other objects into the air and sustain them there. It is believed that the sound-killed mouse died because the high-fre-quency whistling increased its temperature. This ought to make some of our cheerful whistlers feel humble; all they can hope to achieve is to drive us out of ear-shot.
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https://paperspast.natlib.govt.nz/newspapers/BPB19480920.2.31
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Bay of Plenty Beacon, Volume 12, Issue 97, 20 September 1948, Page 6
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138NOISES WE CANNOT HEAR Bay of Plenty Beacon, Volume 12, Issue 97, 20 September 1948, Page 6
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