MAY, 1918 MINING Bulletin of the American Institute of Mining Engineers PUBLISHED MONTHLY SPECIAL FEATURES TECHNICAL PAPERS, See page i. COLORADO MEETING WESTERN TRIP OF INSTITUTE OFFICERS PRESIDENT'S ADDRESS CALIFORNIA MANGANESE AND QUICKSILVER EMPLOYEES' WELFARE INDUSTRIAL REORGANIZATION AFTER THE CONCLUDING DISCUSSION AT NEW YORK HARVARD UNIVERSITY LIBRARY COPYRIGHT, 1918, BY THE AMERICAN INSTITUTE OF MINING ENGINEERS The Portland Filter Automatic. Does not this appeal to you? When we say that the Portland Filter is automatic, we mean that it operates without special attendance and without any attention other than supervision and oiling. Continuous. What does this mean to you? Would not continuous, even discharge of filtrate and residue facilitate your operations and contribute to regularity and simplicity of your subsequent treatment? Economical. This feature surely must attract you. The cost of filtration with the Portland is but a fraction of the cost by other methods. Filtration costing nothing is, of course, impossible, but the Portland will bring you nearest to that ideal. One User Writes:-"After ten months' use, I am pleased to say that the Portland Filter has passed expectations in the handling of a difficult collodial slime with satisfactory washing, the capacity being 20% over the rating. One cloth lasted 7 months, the only other repair being the replacement of the worm drive, which was cut out by grit getting on the gear, due to carelessness." Pamphlet 28-C describes it fully and contains matter well worth reading Colorado Iron Works Co. Ore Milling Machinery and Smelting Equipment Since 1860 30 Church Street NEW YORK, N. Y. Denver, Colo. [Please mention this BULLETIN when writing advertisers.] Bulletin of the Carbocoal. BY C. T. MALCOLMSON. A Concrete Example of the Use of Well Logs. BY MOWRY BATES. Theory of Volcanic Origin of Salt Domes. BY E. L. DE Golyer.. Requa, M. L.-Methods of Valuing Oil Lands. Discussed by E. W. Shaw 1014 Lewis, J. O., and Beal, C. H.-Some New Methods for Estimating the Miller, S. W.-Some Structures in Steel Fusion Welds. Discussed by G. F. |