Abstract
THOUGH the original purpose of these lectures was to arouse the interest of juveniles in the phenomena of sound and their applications, they must have appealed with equal force to those adults who were so fortunate as to hear them. Here the lectures are put into book form, with necessary diagrams and additional dainty illustrations which add much to the attractiveness of the text. Even to the student who is conversant with the ordinary text-books, much of the information must be new; this is particularly the case in the lecture on "Sounds of the Country,"in which are de-'scribed the methods by which sound-waves are generated by insects and by the passage of wind through the foliage of trees. In the following lecture on "Sounds of the Sea "the most attractive subject is the gradual development of the human ear from the simple rudimentary ear of the fish. The interest of the subject culminates in the last lecture on "Sounds in War,"where Sir William Bragg's first-hand knowledge is applied to the description, in the simplest language, of the ingenious devices used in locating submarines, enemy guns on land by "sound-ranging,"and the direction of enemy mining operations by the geophone.
The World of Sound: Six Lectures delivered before a Juvenile Auditory at the Royal Institution, Christmas, 1919.
Sir
William
Bragg
By. Pp. viii+196. (London: G. Bell and Sons, Ltd., 1920.) 6s. net.
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The World of Sound: Six Lectures delivered before a Juvenile Auditory at the Royal Institution, Christmas, 1919. Nature 107, 200 (1921). https://doi.org/10.1038/107200a0
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DOI: https://doi.org/10.1038/107200a0