PERIOD OF STRING 83 



damped oscillation, and the string does not actually 

 come to rest for a definite time. During this time t 





m 





FIG. 38. Example of line sketch from photograph, wired 

 by the Korn Telautograph from Paris to London. 



there may be n complete vibrations, from which the 

 natural period tjn can be ascertained. If the string 

 be made to cast a shadow over an illuminated 

 slit through which the light passes when it is 



G 2 



