Morse, Philip McCord,   1903- <br/><br/>
Vibration and sound / 
Philip M. Morse. 
 - 2nd ed. 
 - New York :  McGraw-Hill,   1948. 
 - xix, 468 pages :  illustration. ;  24 cm. 
 - International series in pure and applied physics. .
<br/><br/>p. 433 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Vibration.<br/>Sound.