How it works :  the illustrated encyclopedia of science and technology / 
Edited by Ralph Hancock...[et al.]. 
 - New york :  Marshall Cavendish,  c 1978. 
 - Vols. :  ill. ;  28 cm. 
<br/><br/>V. 15- Rectifier - sextant ; 
<br/><br/>333  333 
<br/><br/><label>ISBN: </label>0-85685-522-7(set) 0-85685-22I-x(v.II) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Dictionaries & encyclopedias.
<br/><br/><label>Dewey Class. No.: </label>503 / I6