Gregory, Richard & Hadley, H. E.  <br/><br/>
A CLASS BOOK OF PHYSICS 
R. A. GREGORY 
 - LONDON  MACHILEN  1913 
 - 248 PAGES 
<br/><br/> Pg mean Physics General & Mechanics Page 457-464 in A to Z Accession Register (Acc. No. Pg1-Pg228) & Page 640 (Acc. No. 224-231) 
<br/><br/><label>Dewey Class. No.: </label>PG23