Poynting, J.H. and Thomson, J.J. <br/><br/>
A Text -Book of Physics  
Sound 
 - 9 
 - London  Charles Griffin and Company, Limited  1927 
 - 164 
<br/><br/><label>Subjects--Personal Names: </label> Physics 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physics