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The Economic Factors Governing The Location And Design Of A Fish Meal Plant, William Henry Hellwege
The Economic Factors Governing The Location And Design Of A Fish Meal Plant, William Henry Hellwege
Masters Theses
"It was the purpose of this work to make a comprehensive survey of the fish meal industry throughout the United States, to investigate the feasibility of increasing the production of fish meal along the Gulf Coast, and to propose a plant of assumed capacity for the processing of whole fish for the production of fish meal"--Introduction, page 2.
A Study Of The Retort Zinc Distillation Process, Albert Hoffman
A Study Of The Retort Zinc Distillation Process, Albert Hoffman
Masters Theses
"The problem of this thesis is to determine the optimum density of packing of the charge to a zinc retort under exact industrial conditions of temperatures and materials as it affects the production of zinc metal. It is well known that the quantity of zinc produced per cycle is benefited by increasing the density of charging, but increased density of packing or charging is limited by the diffusion, through the charge of the gases necessary to carry on the reduction reactions. In commercial practice there is also a secondary limitation dependent primarily upon the rate at which the heat can …
Hysteresis Loss Of Supermalloy At Different Temperatures, Chester Ray Holland
Hysteresis Loss Of Supermalloy At Different Temperatures, Chester Ray Holland
Masters Theses
"The object of this investigation was to measure the hysteresis loss of supermalloy at different temperatures, and to see if temperature had any effect on hysteresis loss and permeability. The maximum magnetizing current was held constant for all temperatures"--Introduction, page 1.
An Investigation Of The Reduction Of Rutile Copper Oxide Mixtures With Magnesium, Tryggve Smedsland
An Investigation Of The Reduction Of Rutile Copper Oxide Mixtures With Magnesium, Tryggve Smedsland
Masters Theses
"It is known that the addition of titanium to certain types of brasses and bronzes gives them additional valuable properties. The copper-titanium master alloy which is the natural addition agent for making these brasses can not, however, be used if it has been made aluminothermically. It appears that aluminum in the master alloy makes it useless for the above purpose. It should, therefore, be worth while to determine if it is possible to produce a copper-titanium alloy by some method which eliminates the contamination by aluminum, and which would give a copper-titanium which could be used with advantage as an …
Dust Control In Mining Industry And Some Aspects Of Silicosis, Mathuramuthoo Subramanyam
Dust Control In Mining Industry And Some Aspects Of Silicosis, Mathuramuthoo Subramanyam
Masters Theses
"The deleterious effect on human beings of dust in mine air is well-known. It is the duty of engineers, therefore, to take measures to eliminate it. It is now definitely established that of all the various types of dust encountered in mine air, silica dust is the most harmful. This dust, if inhaled over a period of time, causes the disease, silicosis, which in most countries is compensated for as a physical disability. The prevention of alleviation of this scourge is analyzed in three broad aspects: 1. If the mine air is as clean as outside atmospheric air, silicosis will …
Graphical Cost Analysis, Pranlal Girdharlal Sheth
Graphical Cost Analysis, Pranlal Girdharlal Sheth
Masters Theses
"This study made in the present work is an attempt to use the graphical methods to analyse the various cost functions of mineral production, viz., cost of labor, and materials (explosives, supplies, etc.) and to investigate their behavior with regard to the production of ore. Graphs and charts show, in a pictorial way, the relative magnitudes of changes in the factors of production that take place with the process of time. Besides being a visual comparison of the various series plotted, the graph develops and build analytical thinking and permits one to obtain the proper perspective. Today, engineers, in constantly …
Liquid-Vapor Equilibria In The System Methanol-Ethylene Glycol-Water, John Wilson Sjoberg
Liquid-Vapor Equilibria In The System Methanol-Ethylene Glycol-Water, John Wilson Sjoberg
Masters Theses
"The freezing points of the system methanol-glycol-water were investigated by Conrad, Hill and Ballman to determine the suitability of such mixtures for use as an antifreeze. The low freezing points obtained seem to warrant further investigation of other properties of the system. Especially important would be the vapor-liquid equilibrium relations of the system, since one of the desirable features of such a mixture would be low vapor pressures. It is well known that when one substance is dissolved in another, each lowers the vapor pressure of the other. It was for the purpose of determining these relations that the present …
The Influence Of Cartridge Diameter On The Effectiveness Of Dynamite, Charles Harding Noren
The Influence Of Cartridge Diameter On The Effectiveness Of Dynamite, Charles Harding Noren
Masters Theses
"For many years the manufacturers of explosives have attempted to show the advantages of using dynamite of a cartridge diameter of at least 1-1/8 inches. Tests by the manufacturers and by the United States Bureau of Mines hare definitely shown that the dynamites prepared in larger diameter cartridges have several advantages: They are more sensitive to detonation; they detonate at a higher velocity; they are resistant to water; they are safer to use; and they are more stable than dynamites made in smaller diameter cartridges. In spite of these advantages listed, several large consumers still insist on smaller diameter cartridges. …
Studies Of Contact Angles On Oxidized Copper Minerals, John Stewart Carr
Studies Of Contact Angles On Oxidized Copper Minerals, John Stewart Carr
Masters Theses
"Effective flotation of an ore is the result of several factors: selection of suitable reagents; the proper combination of reagents, processing conditions of the operation proper such as time intervals involved and the machinery used. To focus the investigation on a specific field it was decided to investigate in some detail the behaviour of the more popular collectors toward oxidized copper minerals. This investigation was carried out chiefly by applying contact-angle measurements as obtained with the various collectors on the basic carbonate and oxide copper minerals. This basic information was desirable before carrying out actual flotation tests. There was little …
A Comprehensive Traffic Survey For The City Of Rolla, Phelps County, Missouri, Leon Hershkowitz
A Comprehensive Traffic Survey For The City Of Rolla, Phelps County, Missouri, Leon Hershkowitz
Masters Theses
"The ultimate aim of this comprehensive traffic survey for the city of Rolla, Phelps County, Missouri, is to furnish a guide or pattern together with the necessary forms, maps and charts, that can be followed and reproduced by any city having a population of less than 10,000 in a study to determine its particular traffic problems. This survey should serve as a guide in determining what corrective action can be taken in connection with the following: (1) The improvement of location of state highway trunk [sic] routes, by-pass routes, auxiliary routes, and county roads in the city's immediate area. (2) …
A Comparative Study Of Some Rock Drill Bits, Paul Louis Terrasson
A Comparative Study Of Some Rock Drill Bits, Paul Louis Terrasson
Masters Theses
"This paper describes a comparative study which was made of the wear and efficiency of different types of rock-drill bits when used under various drilling conditions...The four types of experiments which were carried out had the following purposes: 1. Determine the influence of the size of the bit. 2. Determine the influence of the design of the bit. 3. Determine the influence of the type of hammer. 4. Compare the performances of steel and tungsten carbide bits in limestone and in granite"--Introduction, page 1.
A Study Of The Separation Of Wolframite From Tin-Oxide, Chih-Wen Ying
A Study Of The Separation Of Wolframite From Tin-Oxide, Chih-Wen Ying
Masters Theses
"A number of mines in china, Bolivia, England, and other countries contain both tin-oxide and wolframite. Owing to the fact that the specific gravity of tin-oxide and wolframite is so nearly the same, considerable difficulty is experienced in making a gravity separation, and all attempts to do so by wet or dry concentration have given very poor results. The perfection of magnetic separators has done much to mitigate this difficulty, so that now complex ores of this nature can be treated in a satisfactory manner. The mixed concentrate from the tables or other concentrators, after being roasted to expel sulfur …
The Determination Of The Surface Tension Of Benzyl Ether, Sze-Kwei Min
The Determination Of The Surface Tension Of Benzyl Ether, Sze-Kwei Min
Masters Theses
"The accurate determination of surface tension is of importance in the investigation of theories of surface structure, the structure of liquids, molecular cohesion, in the study of colloids, especially in physiological work, and in various lines of technical chemistry. The two methods most commonly used for determining surface tension are the capillary rise method and the drop weight method. The theory of the former is simple, but its technique is difficult. Its use in some cases is the cause of errors as high as 30%, due to its inapplicability to certain classes of substance, and is much more sensitive to …
A Preliminary Investigation Of The Titanium-Tin Equilibrium System, James Eugene Reynolds
A Preliminary Investigation Of The Titanium-Tin Equilibrium System, James Eugene Reynolds
Masters Theses
"Titanium is estimated to comprise about .63% of the lithosphere and atmosphere. This would render it the ninth in abundance of all the elements, and fourth in abundance of the metals suitable for mechanical and structural uses, being exceeded only by iron, aluminum, and magnesium. It is approximately 400 times more abundant than lead, which is generally considered to be quite plentiful. The chief restriction of the commercial availability of titanium in its pure form has been the difficulty of reducing it from its ores. Several methods have been proposed in the past and recent years, and R. S. Dean …
A Study Of The Ventilation Of The Hiawatha Mine, Menominee Iron Range, Michigan, Thomas Alan O'Hara
A Study Of The Ventilation Of The Hiawatha Mine, Menominee Iron Range, Michigan, Thomas Alan O'Hara
Masters Theses
"Mine operators in the Menominee iron range have become aware of the need for adequate ventilation to reduce the amount of dangerous dust in the air. Dust-excluding respirators and water sprays are used but it is apparent that the prevalence of diseases caused by dust will be appreciably reduced only if an adequate amount of fresh air reaches the working places. During the past five years the necessity for direct control of the underground working environment has become particularly urgent. The increase in production rate, with two-shift and three-shift operation replacing the single shift, has complicated the problem of dealing …
Analysis Of Simultaneous Faults By The Method Of Symmetrical Components, Robert Marshall Montgomery
Analysis Of Simultaneous Faults By The Method Of Symmetrical Components, Robert Marshall Montgomery
Masters Theses
"The object of this thesis is to present a method for the analytic determination of fault currents and voltages of a symmetrical three-phase system that is subjected to three simultaneous faults. The fault analysis is to be effected by the method of symmetrical components...Though relatively infrequent, simultaneous faults are important because relay systems, operating satisfactorily for single faults, may fail to isolate simultaneous faults. Therefore, it seems worthwhile to have in convenient form a method for calculating short-circuit currents and voltages caused by faults occurring at the same time at three separate and distinct points of a system. It is …
Investigation Of The Stress-Strain Of American Standard Or National Course Bolts, Clare Jackson Thorpe
Investigation Of The Stress-Strain Of American Standard Or National Course Bolts, Clare Jackson Thorpe
Masters Theses
"The purpose of this investigation is to determine, if possible, a formula for the initial tensile load that will consider the Nominal Diameter of the bolt and the yield point of the material from which the bolt is manufactured; to determine, if possible, a torque stress relation, when tightening the bolt"--Preface, page iii.
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 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 …
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 …
The Park City Consolidated Mine Madison County, Missouri, Charles Donald Geiger
The Park City Consolidated Mine Madison County, Missouri, Charles Donald Geiger
Masters Theses
"The purpose of this study is the application of the principles of mining geology to a search for additional ore in one of Missouri's lead mines and to provide in the literature a general analysis of the type of lead deposit found in Southeast Missouri whereby future prospecting and development work on similar deposits may be more efficiently carried on. The study consists of a thorough consideration of the geology and operation of the mine being worked by the Park City Consolidated Mines Company, Missouri Division, at Fredericktown, Madison County, Missouri. The field work was conducted during the months of …
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, …
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 …
The Effects Of Low Concentrations Of Sulphur Dioxide On Oxidized Manganese Ores At Elevated Temperatures, William Henry Magill
The Effects Of Low Concentrations Of Sulphur Dioxide On Oxidized Manganese Ores At Elevated Temperatures, William Henry Magill
Masters Theses
"Although there are large quantities of manganese ore in the United States, most of it is low-grade and cannot be used for the production of ferromanganese. Much government and private research has been done to concentrate the domestic low-grade ores but many problems have been encountered. A large number of treatments have been found necessary for ores from various sections of the country. Low-grade ores have been sulfated with sulfur dioxide in the gaseous state at elevated temperatures and the soluble manganous sulfate extracted with water. This gave a solution of manganous sulfate that may be used for the recovery …
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 …
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 …
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 …