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By McCall. F. E., J. Cervik, A. A. Campoli, P. Thakur

The cross-measure borehole system is a common method of controlling gob gas throughout Europe. Drainage holes are drilled into the strata adjacent to the coalbed being mined. Removal of the coal on a longwall panel relaxes and fractures the adjacent strata, enabling these holes to draw out the methane. A test in the Upper Kittanning Coalbed demonstrated the capture of 50% of the total methane generated by the mining operation. A test in the Pittsburgh Coal bed was not as effective.

Jan 1, 1985

By R. H. Foley

It is difficult to consider any seam as unsuitable for longwall mining operation for something like 95% of British coal is produced by this system. The following is a brief report on how they do it-their techniques and equipment. Depth of working in British mines varies from about 150 ft to more than 3000 ft, with the average being about 1300 ft. Average seam thickness is approximately 40 in., but working seams vary from 16 in. to as much as 14 ft.

Jan 8, 1965

Those in charge of the Second Pan-American Financial Conference say that the engineering profession will be well represented at the Janu-ary conference in Washington. Latin American engineers are more closely connected with important industrial projects and have a greater command in matters pertaining to the developments on which they are working than is the case in the United States. Our own engineering profession may. therefore do well to study the Latin-American plan of cooperation between capital and the engineers.

Jan 11, 1919

By J. A. Gay

BRITISH success in extracting significant quantities of germanium from gas works flue dusts has been one of the prime forces in promoting similar research in the United States. Pittsburgh Consolidation Coal Co. and Pennsylvania Coal & Coke Co. are two of the larger U. S. firms with germanium from flue dust research programs. British interest in germanium started in 1933 when V. M. Goldschmidt reported that some coals from the Yard Seam of Northumberland and Durham contained 30 to 50 ppm of germanium.

Jan 8, 1953

By R. G. Fleck, W. R. Webb

The concentrate produced from the Adirondack magnetites is, of course, too fine for direct use in a blast furnace and must be agglomerated before it can be considered a blast furnace ore. The four operations in the area use sintering -three, including the Jones & Laughlin operation, employing the Dwight Lloyd continuous type machine and one operation using the Greenawalt batch type process. Each operation uses fine anthracite coal, either No. 4 or No. 5 buckwheat size, for the mix fuel.

Jan 6, 1950

By Kenneth L. Zonge

Recently, extensive field use has been made of a digital minicomputer incorporated into a modified geophysical prospecting method. This is a generalized induced polarization (IP) system called complex resistivity (CR) and has been successfully used in sulfide mineral exploration. The ease of use, portability and cost effectiveness of this computer-controlled method has provided a viable exploration tool based on a complex data acquisition system. Without the computer, this method would still be relegated to tedious laboratory measurements and theoretical studies.

Jan 1, 1976

By Joseph D. Weeks

FIFTY-eight years and a day, full of labor, of achievement and of honor had been completed when, at Pittsburgh, on the 5th day of May, 1892, the wheels of a life that had but just before lost its inspiration stood still, and the work here of William Powell Shinn was at an end. Born at Burlington, N. J., May 4,1834, he received such an education (and it was. the only school education he ever had) as the public

Jan 1, 1893

By C. Jardine, D. Freudenreich

The system concept is to minimize costly unscheduled equipment breakdowns by replacing components earlier than their life expectancy. Periodic unit services are scheduled according to preset constraints. Service sheets are generated by matching a job and component master listing based on assigned cyclic component lives. The system can account for all man-hours reported, and history information can be selectively retrieved. By reducing unscheduled equipment shutdowns, this system allows for better manpower utilization and an overall improvement in equipment reliability and availability.

Jan 1, 1982

By Cleland N. Conwell

Reclaiming mined land in northern regions is less difficult than reclaiming semiarid lands. In 1972, the Usibelli coal mine near Healy, Alaska, initiated experimental plots to determine the proper grasses and amounts of fertilizer. The following spring, approximately 1600 acres of land disturbed by mining were seeded by low-flying aircraft. The reclamation project was evaluated by the State of Alaska and has been adjudged successful. The information gained is being used in reviewing prospecting permits and granting coal leases on state lands.

Jan 1, 1977

By K. A. Natarajan, I. Iwasaki

The influence of dissolved oxygen and the Pt - Pt-O reaction on the measurement of redox potentials in solutions containing ferrous-ferric couple was examined. Current-potential curves were used to illustrate the shift in measured potentials toward the oxygen potential in oxygenated and deoxygenated systems at low concentrations of ferrous and ferric ions. The ranges of concentrations of the ferrous-ferric couple, in which the interference from oxygen and the platinum-oxygen reactions becomes significant, are illustrated through the mixed potential mechanism.

Jan 1, 1975

By Will B. Jamison

It is a fact that the most serious safety problems encountered in US underground coal mines are related to roof-bolting operations. It is also true that roof bolting is usually the operation which limits coal production from a mine section. There has been a recent focus on activity involving roof bolting research, development, and new ideas as people concerned about mine worker safety and productivity realize that significant progress can be made in these areas, even with equipment presently available.

Jan 7, 1977

THE following letter from the Rector of Louvain University, addressed to Mr. Adams and the other delegates of the Founder Societies, will be of interest to members of the Institute. It is my duty, in the name of the University of Louvain and in my own personal name, to thank you and the representatives of the Founder Societies of the "United Engineering Society" for the very kind letter of congratulations which you sent to me from Brussels on the 5th of July.

Jan 1, 1928

At its meeting on February 21, 1933, the Board of Directors the following resolution defining and expressing the policy of the Institute with respect to official participation or action in controversial matters: WHEREAS, the Board of Directors at its last meting passed the following resolution: "The Board of Directors, having been appealed to by several Local Sections for advice concerning the attitude and policy of the Institute relating to the endorsement of candidates for public office, the following statement of policy is formulated:

Jan 1, 1942

At its meeting on February 21, 1933, the Board of Directors the following resolution defining and expressing the policy of the Institute with respect to official participation or action in controversial matters: WHEREAS, the Board of Directors at its last meting passed the following resolution: "The Board of Directors, having been appealed to by several Local Sections for advice concerning the attitude and policy of the Institute relating to the endorsement of candidates for public office, the following statement of policy is formulated:

Jan 1, 1939

By John M. Karpinski, David S. Cahn

For many years the green and dry compressive strengths of pellets have been considered as possible criteria of pellet performance during induration. Little attention, however, has been given to standardizing the unfired pellet compressive strength test or to determining the characteristics of this test. The purpose of this study was to compare the constant deformation rate test with constant loading rate tests. In addition, the dependence of these tests on such pellet properties as size and weight was to be investigated.

Jan 7, 1969

By A. Wahab Khair, Nagendra P. Reddy

This paper attempts to evaluate the effectiveness of rock reinforcement on underground coal mine entries using analytical technique. A two dimensional finite element analysis has been carried out to see the difference in the 4-entry stability with and without rock reinforcement. A total of eight models with different thicknesses of the immediate roof layer, different material properties, and different anchorage horizons of the bolts were considered in the analysis to see how the safety factors of these entries can be improved.

Jan 1, 1983

By D. M. Deason, G. Y. Onoda

Phosphate clay wastes, as currently produced, leave montmorillonite clay in a highly dispersed and disintegrated form. Alternative processing, where the extent of swelling and self-disintegration of such clays is controlled or limited, may result in improved settling and consolidation behavior. In this study, a method to control montmorillonite dispersion, through preservation of clay tactoids, was examined. Through this process, significant improvements in settling rates and sediment solids concentrations were achieved in both pure clay systems and on simulated phosphate clay wastes.

Jan 1, 1985

The report of the Nominating Committee was presented and is given in this same Bulletin. A petition was received for new requirements for membership in the Institute and was ordered to take the statutory course. A petition was received for the establishment of a Tulsa Section of the Institute and was referred to a committee to report on the territory. Thirty-six Members, two Associates, and two Junior Members were elected. The status of two Junior Members was changed to Member.

Jan 12, 1917

A special war committee of the Engineering Council has been appointed to assist other committees of the United Engineering Societies having to do with the development of the arts and sciences related to warfare. One of the principal functions of this additional committee is to pass upon the probable value of new inventions. The new committee has established headquarters' in the rooms of the Naval Consulting Board in New York City, and has received the franking privilege of the Post Office Department.

Jan 1, 1918

By C. A. Mezger

These districts are limited approximately on the north by the railroad from Salisbury to Ashville, and comprises the counties of Alexander, Catawba, Burke, Rutherford, McDowell, Cleveland, Lincoln, Polk and Henderson in North Carolina, and Greenville, Spartanburg, Union and York in South Carolina. The occurrence of monazite at Amelia Court House, in Virginia, belongs evidently to the same geological system, as its distance from the Alleghenies corresponds with that of the above-mentioned districts, and all the stratification runs parallel with those mountains.

Jan 1, 1896