Walsh, John W. T. <br/><br/>
Photometry / 
by John W. T. Walsh ; illustrated with diagrams by Frederick G. H. Lewis 
 - London :  Costable,  1926 
 - xxvii, 505 p. ;  25 cm. 
<br/><br/> Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Photometry<br/>Photometry--Bibliography