Volume 73
Containing the Papers and Discussions on Mining and Sampling Presented at Meetings Held in New York, February, 1925; Salt Lake City, Utah, September, 1925; Institute of Metals Division, Syracuse, N. Y., October, 1925; and New York, February, 1926

Title Page

Preface

Contents

Officers and Directors

Technical Committees

Necrology

Biographies

PROCEEDINGS OF MEETINGS

MEETING	DATE
Salt Lake City Meeting	September, 1925
Syracuse Meeting	1925
New York Meeting	February, 1926

PAPERS:

Non-ferrous Metallurgy

TITLE	AUTHOR
Effect of Zinc Oxide on the Formation Temperatures of Some Ferrous Slags (with Discussion)	Horace Tharp Mann
Recovery of Copper by Leaching, Ohio Copper Co. of Utah (with Discussion)	Arvid E. Anderson and Frank K. Cameron
Leaching Mixed Copper Ores with Ferric Sulfate; Inspiration Copper Co. (with Discussion)	G. D. Van Arsdale
Production of Ferric Sulfate and Sulfuric Acid from Roaster Gas (with Discussion)	G. L. Oldright, H. E. Keyes and F. S. Wartman
Conductivity of Electrolytes Used in the Electrolytic Separation of Silver and Gold (with Discussion)	F. F. Colcord, E. F. Kern and J. J. Mulligan
Improvements in the Series System of Electrolytic Copper Refining Recently Developed by the Nichols Copper Co. (with Discussion)	M. H. Merriss
Anaconda Electrolytic White Lead	R. G. Bowman
Lead Smelting in Utah (with Discussion)	B. L. Sackett, Carlos Bardwell, Simon Jacobson and N. H. Jensen
Chief Consolidated Volatilization Process and Mill (with Discussion)	G. H. Wigton

Milling and Concentration

TITLE	AUTHOR
Method of Unloading Ores and Coarse-crushing Practice at Magna Plant of Utnh Copper Co. (with Discussion)	B.E. Mix and L.M. Barker
Mechanism of Filtration (with Discussion)	Arthur W. Hixson, Lincoln T. Work and Isaac H. Odell Jr.
Classification in Witwatersrand Mills (with Discussion)	Bennett R. Bates
An Investigation of Crushing Phenomena (with Discussion)	A. M. Gaudin
Chloridizing Mill of the Standard Reduction Co. (with Discussion)	H.P. Allen and Wm. C. Madge
Milling Practice at Midvale	C.A. Lemke
Effect of Cyanogen Compounds on Floatability of Pure Sulfide Minerals.-I (with Discussion)	E.L. Tucker and R.E. Head
Effect of Cyanogen Compounds on the Floatability of Pure Sulfide Minerals.-II	E.L. Tucker and R.E. Head

Non-metallic Minerals

TITLE	AUTHOR
Mining and Preparation of Eastern Molding Sands (with Discussion)	R. M. Bird
The Use of Standard Tests of Molding Sands (with Discussion)	H. Ries
American Glass Sands, Their Properties and Preparation (with Discussion)	Charles R. Fettke
Washing and Sizing Sand and Gravel	Edmund Shaw
Preparation and Use of Industrial Special Sands (with Discussion)	W. M. Weigel
Borate Deposits Near Kramer, California	Hoyt Stoddard Gale

Institute of Metals

TITLE	AUTHOR
Mechanical Properties of the Aluminum-Copper-Silicon Alloy as Sand Cast and as Heat Treated	Samuel Daniels and D. M. Warner
Effect of Reheating on the Al-Cu-Ni-Mg and the Al-Cu-Fe-Mg (Piston) Alloys	Samuel Daniels
The Lead-antimony System and Hardening of Lead Alloys (with Discussion)	R. S. Dean, Lyall Zickrick and F. C. Nix
A Preliminary Study of Magnesium-base Alloys (with Discussion)	Bradley Stoughton and M. Miyake
Equilibrium Relations in Aluminum-copper Alloys of High Purity	E. H. Dix, Jr., and H. H. Richardson
Modification and Properties of Sand-cast Aluminum-silicon Alloys (with Discussion)	Robert S. Archer and L. W. Kempf
The Microstructure of Aluminum (with Discussion)	K. L. Meissner
The Relation between Metallurgy and Atomic Structure	Paul D. Foote
Hardness of Copper, and Meyer’s Analysis (with Discussion)	Samuel L. Hoyt and T. R. Schermerhorn
The Effect of Lead and Tin with Oxygen on the Conductivity and Ductility of Copper (with Discussion)	Norman B. Pilling and George P. Halliwell
Exudations on Copper Castings (with Discussion)	W. H. Bassett and J. C. Bradley
Microscopic Structure of Copper	H. B. Pulsifier (with Discussion)
Symposium on Gas in Copper
Embrittlement of Copper by Hot Reducing Gases (with Discussion); for discussion see also page 772	T. S. Fuller
Action of Reducing Gases on Heated Copper (with Discussion)	W. H. Bassett and J. C. Bradley
Annealing of Commercial Copper to Prevent Embrittlement by Reducing Gases (with Discussion)	Susan B. Leiter
Estimation of Oxygen and Sulfur in Refined Copper (with Discussion)	W. H. Bassett and H. A. Bedworth
Special Nickel Brasses	Oliver Smalley
The Cracking of the Nickel Silvers in the Course of Annealing (with Discussion)	E. O. Jones and E. Whitehead
Amorphous Cement and the Formation of Ferrite in the Light of X-ray Evidence (with Discussion)	Francis B. Foley

Iron and Steel

TITLE	AUTHOR
The Current Theories of the Hardening of Steel Thirty Years Later (with Discussion)	Albert Sauveur
An Introduction to Ultra-violet Metallography (with Discussion)	Francis F. Lucas
The Effect of Annealing upon the Hardness of Cold-worked Ingot Iron	Charles Y. Clayton
Influence of Temperature, Time and Rate of Cooling on Physical Properties of Carbon Steel. II.	Francis B. Foley, Chas. Y. Clayton and W. E. Remmers
Effect of Air Gap in Explosion System on Production of Neumann Bands (with Discussion)	Francis B. Foley and J. E. Crawshaw
The Iron-tungsten System (with Discussion)	W. P. Sykes
Probable Error in Blast-furnace Records and Calculations Therefrom (with Discussion)	T. T. Read
Making Rimmed Steel (with Discussion)	Carl Pierce
Combustion in the Open-hearth Furnace with Special Reference to Automatic Control	K. Huessener
Elimination of Metalloids in the Basic Open-hearth Process	J. L. Keats and C. H. Herty, Jr.
Chemical Equilibrium of Manganese, Carbon and Phosphorus in the Basic Open-hearth Process (with Discussion)	C. H. Herty, Jr.

Howe Memorial Lecture

TITLE	AUTHOR
Last Twenty-five Years in Metallography	William Campbell

INDEX

TITLE	AUTHOR
Index