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phonautograph

phonautograph


  1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Phonautograph  \Pho*nau"to*graph\,  n.  [Phono-  +  Gr  ?  self  + 
  -graph.]  (Physics) 
  An  instrument  by  means  of  which  a  sound  can  be  made  to 
  produce  a  visible  trace  or  record  of  itself  It  consists 
  essentially  of  a  resonant  vessel,  usually  of  paraboloidal 
  form  closed  at  one  end  by  a  flexible  membrane.  A  stylus 
  attached  to  some  point  of  the  membrane  records  the  movements 
  of  the  latter,  as  it  vibrates,  upon  a  moving  cylinder  or 
  plate.