4406

CHARLES E. WEAVER COLLECTION
UNIVERSITY OF CALIFORNIA

Bulletin of the RIVERSIDE

American Institute of

Mining Engineers.

The Compressed Air System of the Anaconda Copper Mining Co.,

Butte, Mont. By Bruno V. Nordberg,

2225

The Southern Cross Mine, Georgetown, Mont. By Paul Billingsley,

Ore-Dressing Improvements. By Robert H. Richards,

2289

2299

Use of Electricity in Mining in the Butte District. By John Gillie,

A Note on the Occurrence and Manufacture of Refractories in Montana.

By W. H. Gunniss,

2305

2309

The Tin Situation in Bolivia. By Howland Bancroft,

2311

The Coal Fields of Montana. By Eugene Stebinger,

2329

Over-Oxidation of Steel. By W. R. Shimer and F. O. Kichline,

The Life of Crucible Steel Furnaces. By John Howe Hall,

2361

2379

Cement Materials and the Manufacture of Portland Cement in Montana.

By W. H. Andrews,

2383

COPYRIGHT, 1913, BY THE AMERICAN INSTITUTE OF MINING ENGINEERS.

TECHNICAL JOURNALS AND OTHERS DESIRING TO REPUBLISH ARTICLES CONTAINED IN THIS

BULLETIN SHOULD APPLY FOR PERMISSION TO THE EDITOR, AT

29 WEST 39TH STREET, NEW YORK, N. Y.

THEY HAVE A MORE ECONOM-
ICAL WATER CONSUMPTION,
LOWER MAINTENANCE AND
OPERATING COST, AND A VERY
LOW RATE OF DEPRECIATION."

-From Chile Mills vs. Hardinge Mills,
paper presented before the Butte meeting
of the A. I. M. E., by Mr. Robert Franke,
of Miami, Ariz., Aug., 1913.

No. 81

AMERICAN INSTITUTE OF
MINING ENGINEERS.

SEPTEMBER

1913

PUBLISHED MONTHLY

BY THE AMERICAN INSTITUTE OF MINING ENGINEERS

at 124 to 128 N. Seventh St., Philadelphia, Pa.

Guy R. Overend, Publication Manager.

Editorial Office, 29 West 39th St., New York, N. Y.

Bradley Stoughton, Editor.

Cable address, "Aime," Western Union Telegraph Code.

Subscription (including postage), $10 per annum; to members of the Institute, public libraries, educational institutions and technical societies, $5 per annum. Single copies (including postage), $1 each; to members of the Institute, public libraries, etc., 50 cents each.

Entered as second class matter, October 16, 1911, at the post office at
Philadelphia, Pa., under the Act of March 3, 1879.

October Meeting of the Institute.-Invitations have been sent to the members of the following societies through the respective Secretaries to attend the October meeting of the Institute and the Dinner which will be given on the evening of Oct. 17:

American Society for Testing Materials,
American Iron and Steel Institute,

American Society of Mechanical Engineers,
American Society of Civil Engineers,

American Institute of Electrical Engineers,

American Foundrymen's Association.

Members of these Societies have also been invited to contribute to the discussion of the various papers to be presented at the meeting, a revised list of which appears in the notes of the Iron and Steel Committee on p. vi. Many individuals of national and international prominence have also been invited to contribute discussions of these papers, and the response to these invitations has been extremely encouraging.

Oregon Local Section.-At a recent conference in Portland, Ore., of the Secretary of the Institute and some of the local members, the subject of the formation of an Oregon Section was discussed. The suggestion was received with enthusiasm and, as a preliminary step in the formation of such a section, the Oregon members enlisted in a campaign to extend the membership of the Institute within the State as well as to secure papers on Oregon mining and geological subjects.