Admiralty hand book of wireless telegraph,  vol.1, magnetism and electricity 
His Majesty's Stationery Office 
 - 6th ed. 
 - London  Her Majesty's Stationary Office  1938 
 - [various pagings.] 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy and Astrophysics Thesaurus<br/>Telegraphy-Handbook
<br/><br/><label>Universal Decimal Class. No.: </label>(035)621.396  / HMS