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PRESIDENTS DAVID THOMAS 1871 R W RAYMOND 1872-1874 A L HOLLEY1875 ABRAM S HEWITT 1876 T STERRY HUNT 1877 ECKLEY B COXE 1878 - 1879 WILLIAM P SHINN 1880 WILLIAM METCALF 1881 RICHARD P ROTHWELL 1882 ROBERY W HUNT 1883 JAMES C, BAYLES 1884-1885 ROBERT H RICHARDS 1886 THOMAS EGLESTON 1887 WILLIAM B POTTER 1888 RICHARD PEARCE 1889 ADAM S HEWITT 1890 JOHN BIRKINBINE 1891-1892 H M HOWE 1893 JOHN FRITZ 1894 J D WEEKS 1895 E G SPILSBURY 1896 THOMAS M. DROWN 1897 CHARLES KIRCHHOFF 1898

Jan 1, 1937

The volumes of Transactions, which are published annually, contain the list of officers, rules, etc., the Proceedings, and the papers revised for final publication. (In this revision, after the preliminary publication, authors are permitted to use the largest liberty; and the changes and additions made in papers are sometimes important. It should be borne in mind by those who study or quote a paper in the preliminary edition, that they may not have in that form the ultimate and deliberate expression of the author's views. It should be added, however, that in the majority of cases there are no important changes.) These volumes are for sale as follows, in paper covers:

Jan 1, 1910

By George Haworth

ELECTRICAL illumination of shafts, stations, and haulageways has been successfully practiced for many years, but its use in drifts and stopes where mining operations are carried on has- been limited. The large underground drifts of the Tri-State field present a lighting problem that is not satisfactorily solved by the use of the carbide lamp. It has, for some time, been the policy of the Anna Beaver mine to provide ample lighting throughout the underground haulage drifts and working faces. This has, in the

Jan 6, 1928

By Edgar G. Tuttle

The accompanying figures show the arrangement of a twocompartment excentric jig fitted with adjustable and automatic discharges for drawing oft' the lower product obtained in jigging minerals, ores, coal, etc., which is designed to remove or separate more effectively the materials treated, as they travel over the jig from the receiving- to the discharge-points.

Jan 1, 1897

Exploration by AS&R of the Nuestra Senora lead-zinc-silver property, located in Cosala District, Sinaloa, Mexico, has proved sufficient ore to warrant placing the mine on an operating basis. Installation of mine plant, concentrator, and townsite, is expected to commence late in 1951. Opening of a lead-zinc property in Nigeria is also being contemplated by AS&R. Private enterprise is being urged by Secretary of Interior Chapman to start a synthetic fuels industry, it is reported. Based on tests at the Louisiana, Mo., plant which produces quality gasoline at costs up to 144 per gal, he predicts that a commercial plant would pay for itself in 10 years.

Jan 4, 1951

By Thomas V. Falkie

These are exciting times for the coal mining community. Although the industry is in the middle of a healthy boom, there are strong forces tending to counteract or at least temper the rate of growth. There are many pushing and pulling factors of interest to mining people, and a few salient ones will be mentioned here. Primarily because of a tremendous demand for energy, a demand that can't be met by other fuels, the coal industry is in boomsville. Another contributing factor to this situation is the increased overseas demand for metallurgical coal. These demands are being counteracted by a lack of people, the lead-time required to develop new capacity and wildcat strikes, among other things.

Jan 1, 1971

By Robert M. Lewis

At the Scotia plant of Blue Diamond Coal Co., near Cumberland Ky., good recovery and grade can be obtained when floating deep mine coal. When the plant changes over to strip coal, flotation fails, resulting in loss of coal. A procedure was developed at the Minerals Research Laboratory in Asheville, N. C., for recovering strip coal by flotation. Laboratory results were duplicated on a batch scale at the plant. The procedure was found to be effective when tried on a continuous basis in the processing plant.

Jan 1, 1973

NOT all the lead in the country comes from the big operations. A member sends in this photograph of the wash-up from the "Old Timers Lead Mine," at Galena, Ill. He omitted to inclose a flow-sheet of the concentration process, which detracts somewhat from its value to the technical man, and cost figures are lacking. Perhaps he was run off the lease when his questions on milling recoveries became too searching. Still and all, according to the picture the plant ap-pears to be operating efficiently. It is reasonable to believe that the cost of electric power per ton milled is held to a low figure. We commend the proper pro-fessional stance of the gentleman on the business end of the hand jig, though we look in vain for the time honored spring board to aid him in giving the most efficient stroke.

Jan 12, 1927

By A. J. Jacobs

THE purpose of this note is to draw attention to a set of tables, recently compiled in Rocketdyne Research Report No. 64-19, under the title "Crystal-lographic Data for Indexing Cubic Twin Reflections and Cementite (Fe3C) Reflections in Electron Diffraction Patterns."' These tables were an outgrowth of electron-diffraction work conducted over the past several years on steels, precipitation-hardening aluminum- and nickel-base alloys, molybdenum, tantalum, and tantalum-base alloys. The first table lists the indices of possible twin reflections for all the possible twinning planes in bcc and fcc lattices. The twin reflections correspond

Jan 1, 1965

By Robert R. Britton

A study conducted at The Ohio State University sought to deter- mine whether explosives break rock primarily employing shock energy or energy stored as borehole gas pressure. The amount of broken material, calculated borehole pressure, and measured stress waves are compared as decoupling ratios (borehole diameter/explosive charge diameter) increased from 1 to 3 and all other variables remained constant. Breakage and calculated borehole pressure displayed a decrease as the decoupling ratio increased while the shock energy remained constant. The strong implication is that borehole gas pressure is the primarary force in breaking rock with explosives.

Jan 1, 1984

The American Society of Civil Engineers, by a vote of its membership of six to one, has favored the acceptance of the invitation of the three present Founder Societies, namely, the American Society of Mechanical Engineers, American Institute of Electrical Engineers and American Institute of Mining Engineers, to become a, fourth Founder Society and share with the rest the occupancy of the Engineering Societies' Building. Fortified by this vote, the Board of Direction of the American Society of Civil Engineers has caused a contract to be entered into between, that Society and the present Founder Societies and the United Engineering Society. Work has already begun on adding three stories to the Engineering Societies' Building at a cost not to exceed 1250,000. This cost will be borne by the American Society of Civil Engineers, thereby making its contribution approximately equal to that of the other Founder Societies.

Jan 9, 1916

(Under this heading will be published notes sent to the Secretary of the Institute by members or other persons. ) The governing body of the Imperial College of Technology, London, S. W. (Royal School of Mines), will shortly proceed to the appointment of a Professor of Metallurgy. This important Chair has been filled in the past by such eminent metallurgists as John Percy, Sir William C. Roberts-Austen, and others. A large manufacturing company having two iron foundries, blast furnace, etc., requires the services of a chemist, metallographist, and metallurgical engineer qualified to give advice on cast iron practice, and to prescribe remedies for difficulties often met with in the usual iron foundry. The position of converter blower at a side-blow Bessemer steel casting plant is vacant.

Jan 5, 1913

By E. D. Slone, F. L. Dillard

When a new mine is in the planning stages, one of the most important decisions to be made is the selection of' face haulage equipment and the interrelated transportation system to the surface. Equally important is the method of transporting personnel supplies and repair parts from the surface to the working places. When Bell & Zoller management elected to open the new Zeigler mine in the No. 9 seam near Madisonville, Ky., last year, various transportation systems were considered. It was agreed early that a slope mine would be preferred to a shaft mine, and that belt conveyors would be more economical than a rail system.

Jan 1, 1970

The report of the Comittee on Nominations was received and ordered to take the statutory course. Thereupon the chairman was authorized to appoint a committee of three members to report at the next meeting of this Board regarding the suggestions made by the Nominating Committee. The following vote of thanks was then passed to the members of the Arizona Committees and others: "WHEREAS, the Board of Directors of the American Institute of Mining Engineers has a deep appreciation of the splendid success of the Arizona Meeting and WHEREAS, the Board is aware that this success was brought. about by the generous and efficient efforts of the members of the Local Committees, therefore it is

Jan 12, 1916

No. 349.-A Canadian university wishes to engage a man to teach non-ferrous metallurgy and ore-dressing as well as to direct research work. The instruction work covers 7 months but the research work is continued throughout the year. To a suitable man the rank of professor will be granted. Applicants are requested to state education, experience, salary desired and any other particulars that might assist in selecting a man for this position. No. 354.-Wanted, for Northern Nigeria, one chief and two assistant mining engineers, competent surveyors, with good knowledge of alluvial tin mining and dressing of tin concentrate. Preferably with previous Nigerian experience, and exempted or able to. secure passport. Apply in writing, stating qualifications, experience and salary required.

Jan 12, 1918

By B. C. Craft

Oil and gas development in Arkansas during the year 1933 has been marked by considerable wildcat drilling, considering the overproduction prevalent in the oil industry. Arkansas showed an increase in drilling operations during 1933. There were 45 completions from 10 counties resulting in 7 oil wells and 38 dry holes, compared with 37 completions resulting in 4 oil wells and 33 dry holes during 1932. Miller County continued to be the most active area, with 18 completions resulting in 3 oil wells and 15 dry holes. Extensive exploration around the Miller County field has more definitely established the producing limits. It has confirmed the belief that produc-

Jan 1, 1934

By K. R. Crocker

PRIMARY blasting at the open pit of the Cananea Consolidated Copper Co. has been developed to meet several conditions peculiar to the operation. Mining at Cananea is not confined to the open pit but is in conjunction with the underground mine which has been in operation for many years. Several old stopes included in the pit area were filled with waste obtained in stripping for the pit. The main haulage tunnel for the underground ore passes directly under one section of the pit and at present is but 180 ft below the pit floor. The pit as originally laid out called for an overall final pit limit slope of 60°. However, the upper 275 ft - a fairly soft oxidized capping, was carried at a 50° slope and the lower benches, which constitute 750 ft in combined height, are being mined to an over-all final slope of 60°.

Jan 6, 1950

By Calvin Pierson, R. S. Dean, E. P. Barrett

Wrought iron and steel have been prepared from limonite, hematite, and magnetite ores by gaseous reduction, compacting and squeezing the resulting product at high temperature and finally melting the wrought iron so formed. The structure, analyses, mechanical and magnetic properties of the products are given. It is found that the structure of iron ores is best studied by subjecting them to gaseous reduction and using metallographic technique on the resulting sponge iron. In this way the cell structure of iron ore is clearly shown. The wrought iron made by heating compacted sponge iron to 1450" C., and forging, shows a cell structure inherited from the ore. This cell structure is further preserved in melting and casting the wrought iron. The probable relation of the properties of the materials to this inherited cell structure is discussed.

Jan 1, 1935

Wanted.-Engineer for copper-leaching plant, designing building and operations. No. 361. Wanted.-Competent, designing-engineer draftsman, experienced in mill design, construction and operation. Also in-cement works engineering, ore-dressing or concentrating plants. Should be able to design and make working drawings of machinery. Salary $3000. No. 362. Assistant Manager.-By large mining and cyanide milling company, located in Northern 'Mexico. Applicant must be mining engineer with executive ability; must speak Spanish; have good practical knowledge of principles of mining and cyanidation silver sulfide ores; must be capable of handling large organization during absence of manager. Only first-class, competent man below middle age need apply. Copies of references and full information covering experience required. State minimum salary expected. No. 363.

Jan 1, 1919

By Carl Wagner

J. Pearson (British Iron and Steel Research Association, London, England)—Dr. Wagner has referred to the work of Richardson and Dancy and Gellner and Richardson on the reduction at 900 °C of wiistite films on iron. He has assumed that iron ions and electrons migrate backwards to the iron-wustite interface and that the reduced iron grows on the metal substrate. This would be a possible explanation of the results of these workers were it not for the fact that, as stated by Gellner and Richardson but not stressed, this growth in the center of the specimen can occur even

Jan 1, 1953