Hume, K.J. <br/><br/>
Engineering Metrology 

 - 3rd Ed. 
 - Ludhiana  Kalyani  1970 
 - p.360 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics<br/>Optical Projectors
<br/><br/><label>Dewey Class. No.: </label>621.078 H921E