American Institute of Mining and Metallurgical Engineers

Technical Publication No. 2313 Class E, Metals Technology, January 1948 DISCUSSION OF THIS PAPER IS INVITED. It should preferably be presented by the contrihutqr in person at the New York Meeting. February 1948. when an abstract of the paper will be read. If this is imposs~ble, discussion in writing (a copies) may be sent to the Secretary. American Institute of Mining and Metallurgical Engrneers. 29 West 39th Street, New York 18. N. Y. Unless special arrangement is made, discussion of this paper will close April 25. 1948. Any discussion offered thereafter should preferably be in the form of a new paper.