OF THE

AMERICAN INSTITUTE OF MINING

"

AND METALLURGICAL ENGINEERS

(INCORPORATED)

VOL. LXII

CONTAINING PAPERS AND DISCUSSIONS ON IRON AND STEEL, PRE-
SENTED AT THE COLORADO MEETING, SEPTEMBER, 1918, AT

THE NEW YORK MEETING, FEBRUARY, 1919, AND AT

THE CHICAGO. MEETING, SEPTEMBER, 1919.

NEW YORK, N. Y.

PUBLISHED BY THE INSTITUTE

AT THE OFFICE OF THE SECRETARY

29 WEST 39TH STREET

1920

со