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Articles 18451 - 18480 of 18625
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The Effect Of Rope Speed And Moisture On Mine Scrapers, Ronald L. Carmichael
The Effect Of Rope Speed And Moisture On Mine Scrapers, Ronald L. Carmichael
Masters Theses
"During recent years the use of power drawn scrapers, sometimes called "slushing", for the transfer of ore and waste rock has become standard practice in many mining operations. Scraper types have been developed to meet various operating conditions by trial and error methods and by practical research. The study of scraper efficiency has been confined in the past mainly to power consumption. A detailed study of the effect of rope speed and moisture content of the material being moved on scraping efficiency, under controlled conditions, has not been noted in a review of the literature. The author feels that such …
The Use Of Carbides In Refractories, James Adamson Crookston
The Use Of Carbides In Refractories, James Adamson Crookston
Masters Theses
"With the new demands being made on the ceramic industry in mind, it was thought that an investigation of the ceramic possibilities of certain high melting refractory materials might prove of interest and value. The high melting materials are the oxides, carbides, nitrides, borides, and hydrides. Since a great deal of work has been done on the oxides, and relatively little on the others, the oxides were dismissed. Of the other groups, the carbides seemed interesting. Of the carbides, the following materials were chosen for investigation: Boron Carbide (B₄C), Zirconium carbide (ZrC), and Titanium carbide (TiC). These materials were chosen …
Geology Of The Ozark-Martin Mine Area, Madison County, Missouri, William Clifton Hayes
Geology Of The Ozark-Martin Mine Area, Madison County, Missouri, William Clifton Hayes
Masters Theses
"General descriptions of the region adjacent to the Ozark and Martin Mines of Madison County, Missouri have been included in a number of early publications dealing with the Einstein Silver Mine area, but a detailed geologic map has not been made. It was thought that through detailed mapping and by a detailed analysis of all of the geologic features present, a more definite relationship between mineralization and structure might be determined"--Introduction, Purpose and Scope of Work, page 1.
The Use Of Wetting Agents In Clay Bodies, Nathan Russell Sewell
The Use Of Wetting Agents In Clay Bodies, Nathan Russell Sewell
Masters Theses
"It has been observed that one of the weak points in the present method of commercially preparing stiff mud bodies is the de-airing process, which involves passing them thru a vacuum chamber. Difficulties in maintaining a good vacuum, power costs, and work stoppages due to clogged vacuum chambers, are some of the problems. It was thought that perhaps a very definite contribution could be made in the field of ceramic engineering if some method could be devised for preparing a workable ceramic body of good dry and fired properties without the use of a vacuum chamber. In attacking the problem, …
Stresses In A Plate Having A Relatively Small Circular Hole And Loaded Parallel To The Axis Of The Hole Under Various Conditions Of Constraint With An Application To Deep Oil Wells, A. Dale Topping
Masters Theses
"The object of this investigation is to determine the stresses about a hole in a thick plate of large dimensions compared with the radius of the hole when the plate is loaded parallel to the axis of the hole under various conditions of restraint, and to apply the results to the case of a deep well. The case of a plate with an initial stress in its plane is also considered...The problem arose from difficulties encountered in the drilling of deep oil wells. After drilling has proceeded to a certain depth, the sides of the bore hole apparently collapse and …
Thermal Reduction Of Beryllium Chloride With Metallic Magnesium, Mailand R. Strunk
Thermal Reduction Of Beryllium Chloride With Metallic Magnesium, Mailand R. Strunk
Masters Theses
"The purpose of this research was to investigate the thermal reduction of beryllium chloride by metallic magnesium. Beryllium is a remarkable element, being characterized by its hardness, lightness and durability. Although the art of metallurgy has developed to a point at which most metals can be produced at a low cost, there are a few metals, of which beryllium is an outstanding example, which can only be obtained at high prices and in small amounts because of the difficulties of recovering the metals as such from their compounds which occur in nature. Small amounts of pure beryllium can be obtained, …
Performance Study Of Mechanical Loading Machines In Coal Mining Practice, Kor Uyetake
Performance Study Of Mechanical Loading Machines In Coal Mining Practice, Kor Uyetake
Masters Theses
"In the transition from hand-loading methods in coal mining to mechanical loading methods various types of equipment have been developed to do the same job. Among the coal mining operators and among miners in the coal fields, various equipment preferences have developed. This produces a sharp difference of opinion. emotional statements of such ideas based upon personal likings do not contribute materially to coal mining progress - it merely serves to confuse the issue. The author feels that the opinions on the loading equipment should be based upon some factual data rather than the preconceived idea. Often it is difficult …
The Separation Of The Rare Earths Neodymium And Praseodymium By Precipitation As Chloride, Stanley Milton Kulifay
The Separation Of The Rare Earths Neodymium And Praseodymium By Precipitation As Chloride, Stanley Milton Kulifay
Masters Theses
"The purpose of this thesis is to provide a means of preparing highly purified samples of neodymium and praseodymium compounds when the material to be refined already exists in a state of approximate purity. The method described cannot be profitably used to purify the individual rare earths without first concentrating them. The process is not intended to be quantitative, for it is a fractional crystallization technique using a concentrated hydrochloric acid medium"--Introduction, page 1.
Ceramic Possibilities Of Some Missouri Clays And Shales, Leonard Nathanael Larson
Ceramic Possibilities Of Some Missouri Clays And Shales, Leonard Nathanael Larson
Masters Theses
"Although many of the shales and clays of Missouri have in the past been, or are presently being used for the manufacture of heavy clay products such as face brick, common brick, sewer pipe, and tile, there is in these post-war years a significant shortage of these products within the state and country. Especially in the northwestern part of Missouri is there a distinct shortage, as only one structural clay plant is known to be operating in that area. The St. Louis and Southeastern Missouri districts are better prepared to meet construction demands, with several structural clay plants operating at …
Rapid Determination Of Alumina In Diaspore Clays, Matthew Julius Kerper
Rapid Determination Of Alumina In Diaspore Clays, Matthew Julius Kerper
Masters Theses
"The alumina content of the diaspore clay is the index to its refractoriness, so it is important to know the alumina content of the diaspore clay. Diaspore is mined in comparatively small pits and naturally the alumina content will vary from pit to pit and will vary to a considerable extent in the same pit. Since a uniform finished product is desired, the alumina content of each pit must be known and frequent checks run on the output of the pits. Chemical analysis is the standard method of determining the amount of alumina in clays. The main objections to chemical …
A Comparison Of The Use Of Polaroid And Colored Filters In The Multiplex Aeroprojector, Robert Greig Livingston
A Comparison Of The Use Of Polaroid And Colored Filters In The Multiplex Aeroprojector, Robert Greig Livingston
Masters Theses
"The purpose of this thesis is the drawing of a comparison between the use of the colored filters, which are normally employed in the multiplex aeroprojector by various mapping agencies throughout the country, and the use therein of Polaroid filters. The filters in the aeroprojector serve to break the projection of a stereoscopic pair of photographs into two impressions which are viewed separately by each eye of the observer, thus providing the main requirement for the observance of a three-dimensional effect. this stereoscopic effect is utilized in the multiplex plotting machine for the delineation of contours...In order to form a …
Geology Of The Einstein-Apex Tungsten Mine Area, Joel B. Pomerene
Geology Of The Einstein-Apex Tungsten Mine Area, Joel B. Pomerene
Masters Theses
"The geological problem existing in the Silver Mine area, the relationship of mineralization to structure, particularly to faulting and jointing, was pointed out to the writer by Prof. O. R. Grawe. Several geologists have made reconnaisance [sic] surveys of the whole region, but so far no detailed geologic map has been published of the immediate area. Prof. Grawe pointed out that such a map would be of value in the better understanding of the area and would be especially useful in the event that another national emergency required the development of all possible sources of tungsten"--Introduction, Selection of the Problem, …
The Behavior Of The Metallic Stearates In Chromatography, Theodore Jack Roemer
The Behavior Of The Metallic Stearates In Chromatography, Theodore Jack Roemer
Masters Theses
"While research has been done on the chromatographic adsorption of the metallic ions, it has been confined mainly to the metallic salts in aqueous solutions. Considerable success has been met in the separation of the cations, but certain combinations have proved to be difficult to separate. Therefore, it would seem to be proper to examine the adsorptive behavior of the metallic ions in an organic medium to see if separation could be improved. This seems plausible since it is known that separations of organic substances have been very successful in organic reagents. Since the common inorganic metallic salts are not …
An Investigation Of Various Properties Of The 60co-40cr Alloy, Roger David Moeller
An Investigation Of Various Properties Of The 60co-40cr Alloy, Roger David Moeller
Masters Theses
"The binary alloys of Co-Cr have had a few practical applications in our modern economy due to their high cost. The only extensive field of application has been developed in recent years in the manufacture of high temperature alloys for such equipment as gas turbines, jet engines, and turbo-superchargers. The use of these materials has been limited, due to their high cost, to small parts such as rotor blades in gas turbines. To reduce cost and to add desirable or eliminate undesirable properties, the binary alloys have, from the beginning, been modified with varying amounts of other metals. The modified …
A Study Of The Chemical Behavior Of Some Natural Occurring Iron Disulfide Ores, William Louis Shivelbine
A Study Of The Chemical Behavior Of Some Natural Occurring Iron Disulfide Ores, William Louis Shivelbine
Masters Theses
"A complete investigation of the pyrites deposits of Missouri by Grawe has revealed many large deposits of pyrites available in commercial quantities in the Ozark area. The pyrites has been found occurring in contact with several various types of minerals. In the northcentral Ozark Plateau, pyrites is found associated with hematite-bearing sink structures. In the northwest part of the state, pyrites occurs in coal deposits, which, in the future, may be recovered as a by-product in the production and preparation of coal. Some pyrites, chiefly marcasite, has been found as fracture and cavity fillings in several other districts. The purpose …
The Solubility Of Copper In High-Iron And Low-Iron Slags, Charles Burroughs Gill
The Solubility Of Copper In High-Iron And Low-Iron Slags, Charles Burroughs Gill
Masters Theses
"A thesis giving the details of construction of a rotating induction furnace and its use to experimentally determine the amounts of copper absorbed in high-iron and low-iron slags at various temperatures. A rotating induction furnace is advantageous for slag study in that the slag is contained in a molten pure metal cup and does not come in contact with any refractory, which would be attacked by the slag and contaminate it. The molten pure metal cup is formed by melting the pure metal in a refractory crucible and spinning this inside an induction coil. The induction coil supplies heat for …
A Study Of Certain Properties Of A Cobalt-Chromium-Manganese Alloy For High Temperature Service, Robert Lewis Ray
A Study Of Certain Properties Of A Cobalt-Chromium-Manganese Alloy For High Temperature Service, Robert Lewis Ray
Masters Theses
"The vast amount of attention that has been given to the development of high-temperature service alloys since about 1940 has resulted in the production of numerous compositions for many elevated temperature applications. Particularly in the aircraft industry, with the jet engine, and the power industry, with the gas turbine, have these applications been most demanding. War research has developed a large number of high-temperature service alloys, many of which are in use today, and the alloy ingredients vary widely...it may be readily be seen that there is no one alloy, or one system of alloys which has been developed that …
Beneficiation Of A Zinc Rich Oxidized Ore From Nuevo LéOn, MéXico, Jorge Casas Nieto
Beneficiation Of A Zinc Rich Oxidized Ore From Nuevo LéOn, MéXico, Jorge Casas Nieto
Masters Theses
"Rich zinc ores are relatively rare now in this country but are still abundant in countries like México, that have not yet developed all their mineral potentialities. In almost all Mexican zinc districts there has been reported sporadic production of oxidized ores, although until now no specially designed plants have been built for the beneficiation of such ores. Generally the zinc carbonate and zinc silicate ores are hand picked and shipped to this country for beneficiation. The Mexican production of zinc ores has never been steady, because of economic factors such as bad transportation systems and lack of market for …
The Preparation Of Elementary Fluorine And Its Reactions With Certain Organic Compounds, Robert Knox Neuman
The Preparation Of Elementary Fluorine And Its Reactions With Certain Organic Compounds, Robert Knox Neuman
Masters Theses
"This work had two main objectives: (1) The construction of an electrolytic cell for the production of fluorine, (2) the preparation of some organic compounds containing fluorine. This research was undertaken because of the growing importance of fluorine chemistry, particularly in the field or organic chemistry. Due to the extreme activity of fluorine, it is theoretically possible to prepare many times more fluorine-containing organic compounds than there are known organic compounds today. It has been predicted that fluorine-containing products will be developed to include new and useful dyes, plastics, pharmaceuticals, lubricants, tanning agents, metal fluxes, fumigants, insecticides, germicides, fire extinguishers, …
An Investigation Of The Colorimetric Methods For The Determination Of Fluorine By The Zirconium Alizarin Sulfonate Method, William Lewis Break
An Investigation Of The Colorimetric Methods For The Determination Of Fluorine By The Zirconium Alizarin Sulfonate Method, William Lewis Break
Masters Theses
"There has been a need for a rapid and an accurate method for the determination of fluorine in its compounds. Both gravimetric and volumetric methods have been studied, but both methods were time consuming or inaccurate or both. Colorimetric methods had been studied before F. Richter developed his method but none had been reported to be as satisfactory as his method. This method was investigated because it was thought that F. Richter's method would be a satisfactory colorimetric determination for fluorine in its compounds"--Introduction, page 1.
Some Equilibrium Relations In The System Magnesium Oxide-Sulfur Dioxide-Water (Acid Region) At Pressures Below Atmospheric, Donat Bennes Brice
Some Equilibrium Relations In The System Magnesium Oxide-Sulfur Dioxide-Water (Acid Region) At Pressures Below Atmospheric, Donat Bennes Brice
Masters Theses
"This thesis describes the system Magnesium Oxide-Sulfur Dioxide-Water when brought to equilibrium at various pressures of sulfur dioxide plus water vapor, ranging from the vapor pressure of water at the temperature in question to atmospheric pressure. This system is of significance because it is being used more and more in the "Sulfite Process" in the manufacture of wood pulp and is replacing calcium oxide or a mixture of magnesium and calcium. The solution as it comes from the absorption towers is essentially such a system. Numerous investigators have done work on the system sulfur dioxide and water and the work …
Some Preliminary Work On Metaphosphates In Ceramics, John Frederick Burst
Some Preliminary Work On Metaphosphates In Ceramics, John Frederick Burst
Masters Theses
"For a good many years the accepted method of cementing ceramic joints was with a mixture of fire clay grog and a plastic clay binder. This did not prove too satisfactory for several reasons. Usually when enough plastic clay was added to give good workability the vitrification was lowered to such an extent that either excessive shrinkage or excessive bloating occurred, depending upon the extent to which the vitrification point was exceeded...In order to obtain a cement with high strength throughout a long firing range the manufacturers have turned to the addition of various organic binders and inorganic fluxes. Most …
Further Studies On The Effect Of Grinding Aids For Portland Cement Clinker, Charles Lee Rakestraw
Further Studies On The Effect Of Grinding Aids For Portland Cement Clinker, Charles Lee Rakestraw
Masters Theses
"In the dry grinding of cement clinker to a fine powder in which for example ninety percent or more of the particles are reduced to a fineness below that of a 200 mesh screen, it has been found that further fine grinding is extremely difficult and the energy input is out of all proportion to the further production of fine particles. This seems to be due to the fact that when the bulk of the material reaches this fineness there is a tendency of the finest particles to cling to each other and bunch or flocculate. Along with this tendency …
A Study Of The Transportation Of Mine Rock By Pumping, Howard Morris Fowler
A Study Of The Transportation Of Mine Rock By Pumping, Howard Morris Fowler
Masters Theses
"The conclusions arrived at in regard to the practicability of utilizing pumps instead of skip haulage for the removal of ore and waste from mines are entirely theoretical, as it was impossible to make actual conparative runs. These results were arrived at by comparing known or estimated costs for both types of operations. The abrasion studies were conducted in the laboratory of the Mining Department at the School of Mines and Metallurgy. The pressure tank was designed in an effort to counteract the present necessity for using single stage pumps in sand pumping, and to find a means for eliminating …
Action Of Diatoms On Clay, Joseph Harvey Renfrew
Action Of Diatoms On Clay, Joseph Harvey Renfrew
Masters Theses
"With the recent trend toward the use of higher temperatures and more severe service conditions in the metallurgical and refractories industries there has developed a constantly greater demand for high-alumina clays, that is, clays in which the alumina content is considerably above that of pure kaolinite, Alâ‚‚O₃2SiO₂·Hâ‚‚O. However, the known reserves of good diaspors are so small that ceramic engineers are already turning to basic refractories in order to have sufficient materials for work at high temperatures. Even the slightest reflection on the needs of the refractories industry will show that such substitutions are strictly limited, and possible only where …
An Analysis Of Man Power Efficiency In Drilling Procedures In The Tri-State Mining District, Julian Alban Fuller
An Analysis Of Man Power Efficiency In Drilling Procedures In The Tri-State Mining District, Julian Alban Fuller
Masters Theses
"This thesis embodies the results of an investigation, by the time study method, of certain phases of drilling procedures recently brought into practice in the Tri-State mining district. The field work was accomplished during the months of July, and August 1945; the data obtained therefrom and the analysis presented in this dissertation apply to the practice in effect at that time"--Preface, page ii.
Exploration For Barite Deposits In Cole County, Missouri, Arthur William Brune
Exploration For Barite Deposits In Cole County, Missouri, Arthur William Brune
Masters Theses
"Barite is mined in the Southeastern and Central districts of Missouri. The Counties of Franklin, St. Francois, and Washington comprise the Southeastern district, and the counties of Benton, Camden, Cole, Miller, Moniteau, and Morgan comprise the Central district. Although the latter region is the larger of the two, its production of barite is far less than that of the other. The area which is discussed in this report is in the southwestern corner of Cole County. The main points of the problem were: 1. To determine the features, if any, which apparently controlled the localization of the barite deposits in …
The Mechanical Properties Of Mine Rocks And A Standardized Test Procedure For Their Determination, Walter Edwin Lewis
The Mechanical Properties Of Mine Rocks And A Standardized Test Procedure For Their Determination, Walter Edwin Lewis
Masters Theses
"The problem involves studies of the mechanical properties of rocks and was undertaken in an attempt to determine practical data that will help in estimating the supports required to maintain the roofs of mines during and after mining operations. One of the most important problems in mining today is that of the analysis of the action of mine-rock under stresses. From such an analysis in any given mining venture it should be possible to obtain cheaper methods of mining because the supports necessary to maintain the walls and roof of an excavation may be determined on the basis of how …
The Age Hardening Of Copper-Manganese-Nickel Alloys, William James Barnett
The Age Hardening Of Copper-Manganese-Nickel Alloys, William James Barnett
Masters Theses
"The Bureau of Mines in conjunction with their Electrolytic Manganese Alloys program has developed a series of age hardening copper-manganese-nickel alloys having properties which compare favorably with those of copper-beryllium alloys...An unusual and highly desirable characteristic of these alloys is their insensitiveness to rate of cooling from the solution temperature. Air cooled and water quenched samples will have identical time hardness curves on being aged. Instead of requiring closely controlled conditions characteristic of many age hardening alloys, these alloys cannot be subjected to a thermal mechanical handling which will prevent hardening on their being subsequently heated to the aging temperature. …
Ceramic Properties Of The Clays Of The Polo Gas Field, Clarence Arthur Lambelet
Ceramic Properties Of The Clays Of The Polo Gas Field, Clarence Arthur Lambelet
Masters Theses
"In Western and Northwestern Missouri there exist many natural gas fields of such limited size and of such great dispersion that it is not economical to utilize their products by the construction of pipe lines to consuming centers. Thus a large source of natural wealth is lying idle. This wealth could be utilized, however, if some manufacturing process requiring large amounts of fuel were located in the vicinity...The availability of fuel is the reason for interest in the area, though an investigation should be made to assure the quality and quantity of the fuel in any selected area. the adequacy …