Example in Electrical calculations. 
Great Britain. Naval Electrical Dept 
 - London,  London, H. M. Stationery   1960. 
 - 471 p. illus.   22 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electrical engineering --Problems, exercises
<br/><br/><label>Dewey Class. No.: </label>621.31