Erratum
1945; Nature Portfolio; Volume: 156; Issue: 3971 Linguagem: Inglês
10.1038/156687e0
ISSN1476-4687
ResumoWilmott reported that when he was a child there was in Cambridge a wellknown blind organist who was accustomed to walk about the town without the usual aids.When asked how he did it, he replied that the echoes, for example, from a brick wall, or from a low wall with railings above, appeared to him to be very different.By recognizing the different types of echo he could tell what was near him, and thus locate where he was.This acute sense of hearing even extended to the recognitionat just over two paces-of four ladies who in curiosity to see what would happen stood quite still right across the pavement in the organist's way.The organist hesitated a pace and then came to a complete stop.One of the ladies laughed; thereupon she was instantly recognized by the organist, who said, "I thought there was somebody there".This appears to show that sounds of ordinary frequencies have actually been used by man in much the same way as supersonic sounds are used by bats.(See alsop.692 of this issue.)
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