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The 

World 

of 

Sound 


Jo  William  Henry  Bragg 


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The  World  of  Sound 

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CQ 

William  Henry  Bragg 

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The  World  of  Sound  consists  of  six  lectures  delivered  before  a juvenile  audience  at 

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£ 

the  Royal  Institution  in  1919.  The  Royal  Institution  Christmas  Lectures  are  a series  of 

SI 

lectures  on  a single  topic,  which  have  been  held  at  the  Royal  Institution  in  London 

each  year  since  1825,  except  several  years  during  the  Second  World  War.  The 

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lectures  present  scientific  subjects  to  a general  audience  in  an  informative  and 

entertaining  manner.  Michael  Faraday  initiated  the  first  Christmas  Lecture  series  in 
1825,  at  a time  when  organised  education  for  young  people  was  scarce. 

This  series  of  lectures  is  still  interesting  for  its  basic  explanation  of  sound  and 
hearing,  and  the  history  of  the  research  into  it.  The  last  chapter,  Sound  in  War,  was 
of  course  written  at  a time  when  submarines  and  aeroplanes  were  in  their  infancy. 
Acoustic  mirrors,  used  as  early  warning  devices  of  approaching  aircraft  before  the 
invention  of  radar,  are  described,  but  the  reader  suspects  that  at  the  time  of  writing, 
the  new  invention  of  ASDIC  (the  predecessor  of  Sonar)  was  still  secret  and  so  was 

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not  mentioned  in  this  lecture. 

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Read  for  LibriVox.org  by  Ruth  Golding 

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Total  running  time  4:33:51 

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This  LibriVox  recording  is  in  the  public  domain  and  may  be  reproduced,  distributed  or  modified  without 

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permission.  The  LibriVox  objective  is  to  make  all  books  in  the  public  domain  available,  for  free,  in 

audioformat  on  the  Internet.  For  more  information,  or  to  volunteer,  please  visit  librivox.org 

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Cover  image:  Gaststatten-Grammophon  around  1910,  courtesy  Andreas  Praefcke. 
Cover  designed  by  Availle.This  design  is  in  the  public  domain.