Townsend, John Sealy Edward,  1868- <br/><br/>
Electromagnetic waves / 
John S.E. Townsend. 
 - London:  Hutchinson's Scientific and Technical Publications,  19 51. 
 - 60 p. :  ill. ;  19 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electric waves.
<br/><br/><label>Dewey Class. No.: </label>537.12 TOW