Copyright 1950 by the Colorado School of Mines. All 

 rights reserved. This book or any part thereof may not be 

 reproduced in any form without the written permission of 

 the Colorado School of Mines. 



First Edition, June 1, 1949. 



First Printing, Second Edition, June 1, 1950. 



Second Printing, Second Edition, June 1, 1951. 



Printed by Peerless Printing Co., 

 Denver, Colorado. 



Engravings by Cocks-Clark Engraving Co., 

 Denver, Colorado. 



