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Articles 52531 - 52560 of 52927
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The Microstructure Of Some Commercial Nickel Steels, Robert Newton Stubbs
The Microstructure Of Some Commercial Nickel Steels, Robert Newton Stubbs
Bachelors Theses
"In this thesis it was the author's intention to take up the microstructure of such nickel steel as is generally employed for structural work"--page 3.
The Factors Influencing The Price Of Metals On The Metal Market, Thomas Patrick F. Walsh
The Factors Influencing The Price Of Metals On The Metal Market, Thomas Patrick F. Walsh
Masters Theses
"Every year the various engineering and industrial magazines print curves showing the rise and fall of metal stocks throughout the year. to the ordinary reader, these curves are seldom intelligible; he sees the ups and downs; he knows that the prices have risen and fallen; but he rarely knows what causes these changes -- and the curves themselves never tell. This paper tries to remedy this defect; it draws its curves, and, in the light of historical events, which it recounts, tries to determine the causes for the fluctuations in the market. it further places these factors on the curve …
The Preparation And Physical Properties Of Benzene- And Toluene-Sulphonamides, Karl K. Kershner
The Preparation And Physical Properties Of Benzene- And Toluene-Sulphonamides, Karl K. Kershner
Masters Theses
"The formation of sulphonamide derivatives is often of distinct importance. These substances are easily purified and give sharp mepting points which make them of value for identification phases of research work. Also they are of value commercially as in the production of saccharin and other similar compounds. The purpose of this investigation is to secure information on the comparative production and yield of sulphonamides, and intermediate products, formed from their respective ring hydrocarbons, as benzene and toluene. careful melting point are taken on purified products and solubility curves developed for different solvents. The latter give an interesting basis for comparison"--Introduction, …
Metallurgical Results From Black Copper Smelting, Preston King Horner
Metallurgical Results From Black Copper Smelting, Preston King Horner
Professional Degree Theses
No abstract provided.
The Roasting Of Zinc Ores In The Manufacture Of Sulphuric Acid By The Contact Process, Clarence Eugene Peterson
The Roasting Of Zinc Ores In The Manufacture Of Sulphuric Acid By The Contact Process, Clarence Eugene Peterson
Professional Degree Theses
"The unprecedented demand for sulphuric acid of the higher strengths (98% and higher) in the manufacture of explosives, has stimulated the zinc smelters to increased efforts in the recovery of their Roaster gases in the form of Sulphuric Acid. The Lead-chamber process is unsuitable, however, in making "strong" acid and the smelters naturally turned to the contact mass or catalytic processes. In the roasting of zinc ores practically all of the sulphur is removed as sulphur dioxide, the disagreeable odor and unmistakable injury to surrounding localities, of which, first led to the adoption of sulphuric acid plants by most zinc …
On The Microscopic Determination Of Cadmium In Metallic Zinc, James Presley Gill
On The Microscopic Determination Of Cadmium In Metallic Zinc, James Presley Gill
Professional Degree Theses
"A quick and accurate determination of Cadmium in Metallic Zinc by all ordinary chemical methods now in use, so far as the writer has been able to ascertain is at best only approximate. However, longer methods and very delicate ones for determining Cadmium are in use that are very accurate, but these methods are so long and so delicate that very few commercial laboratories care to use them. Now, it has been known for some time that Zinc and Cadmium do not form an alloy which when in the solid exist either as a solution or a compound. They do …
Graphics And Its Application To The Progress And Cost Analyses Of A House Building Construction Company, Frank Lewis Leonard Wilson
Graphics And Its Application To The Progress And Cost Analyses Of A House Building Construction Company, Frank Lewis Leonard Wilson
Masters Theses
"In the graphical analyses of Stresses in Framed Structures, we study, by means of diagrams, the stability or equilibrium of structures and the relation between the external forces and the stresses created in the members of the frame. The principle involved is that we may represent any force both as to direction and intensity by a straight line, by considering the direction of the line to be identical with that of the force and adjusting its length according to any arbitrary unit adopted for the forces under consideration. By this means we can solve the stresses in framed structures with …
The Occurrence Of Oil And Gas In Osage County, Oklahoma, Donald Hewson Radcliffe
The Occurrence Of Oil And Gas In Osage County, Oklahoma, Donald Hewson Radcliffe
Professional Degree Theses
"Osage, the largest county in Oklahoma, is situated a little to the east of the north central part of the state. It consists of an area of approximately 2,350 square miles, or about a million and a half acres, extending from T. 20 N. to T. 29 N. and from R. 2 E. to R. 12 E. inclusive. As this country lies between some of the best oil producing areas of the State, as it is definitely known to be folded, and as the folds tested have proven that the chances of obtaining production on favorable "structure" in the Osage …
Electrolysis Of Neutral Solutions Of Znso₄, Knud Fabricius Hansen
Electrolysis Of Neutral Solutions Of Znso₄, Knud Fabricius Hansen
Professional Degree Theses
"The purpose of the following experiments was to obtain informations concerning the character of the deposits, the efficiencey [sic], et al. in the electrolysis of neutral solutions of ZnSo₄"--Purpose, page 1.
Determination Of Critical Point Of Concentrating Tables On Arizona Copper Ore, J. C. Finagin Jr., W. C. Hogoboom
Determination Of Critical Point Of Concentrating Tables On Arizona Copper Ore, J. C. Finagin Jr., W. C. Hogoboom
Professional Degree Theses
"In the concentration of an ore by means of concentrating tables, there is a critical point in sizing beyond which the valuable minerals can not be recovered. Theoretically, the lighter gangue is washed over the side of' the table and the heavier mineral, regardless of size, is recoverable at the end, these concentrates being graded from coarse to fine sizes up the slope of the table. In practice, however, the finer sizes of concentrates are found mixed with the middlings and tailings, as indicated by the arrows on the diagram of the concentrating table shown below. The problem is to …
Measurement Of Air Under High Pressure By Orifice Method, George E. Mellow
Measurement Of Air Under High Pressure By Orifice Method, George E. Mellow
Bachelors Theses
"The measuring of compressed air, under high pressures, by means of observing the drop in pressure on passing thru an orifice, is in a new field of endeavor. The necessity of measuring compressed air, in order to handle it economically, is obvious. Hence, the importance of a simple device by which this may be done. A device, which may be duplicated at any time, at any place, with very little expense, and ordinary materials"--Introduction, page iii.
Some Tests On The Grinding Of Cement Clinker With A Hardinge Conical Ball Mill, Gilbert F. Metz
Some Tests On The Grinding Of Cement Clinker With A Hardinge Conical Ball Mill, Gilbert F. Metz
Professional Degree Theses
"The Hardinge Conical Mill is the invention of Mr. H.W. Hardinge and has been fully patented by him. It has been used successfully in the grinding of ores, limestone, phosphate rock, feldspar and talc. The purpose of the tests in this thesis was to determine the worth and adaptability of the Conical Mill for the preliminary grinding of cement clinker and to determine the relative merits of this type of grinder as compared to the roll type of grinder. The tests herein were performed under the direction of the writer assisted personally and through correspondence by Mr. H.W. Hardinge of …
Chemical Control Work In The N. K. Fairbanks Factories, John Whittlesey Bodman
Chemical Control Work In The N. K. Fairbanks Factories, John Whittlesey Bodman
Professional Degree Theses
"We propose to discuss in this thesis the organization of the N. K. Fairbank Company, particularly with reference to the duties of the Chemical Division, Operating Department in this organization. From a broad viewpoint, we believe that the particular organization by with the N. K. Fairbank Company secures application of its chemical ability to manufacturing operations as well as to special problems, is characteristic of a widespread movement taking place for recognition of the chemical engineer in industry. This is particularly true in those industries where manufacturing operations are based primarily upon practical applications of chemical principles"--Abstract, page 1.
Descriptive Study Of The Petroleum Refinery At MinatitláN, GermáN GarcíA Lozano
Descriptive Study Of The Petroleum Refinery At MinatitláN, GermáN GarcíA Lozano
Professional Degree Theses
"In order to reduce as much as possible the cost of transportation of the crude oil to the refinery, the city of Minatitlán of Minatitlán County in the State of Veracruz was chosen as the most proper place for establishing the refinery it being in the center of the only oil fields which at that time possessed the "Eagle Mexican Petroleum Co."--page 1.
The Goltra Process Of Concentrating Iron Ores As Developed At Waukon, Iowa, Ernest Wander
The Goltra Process Of Concentrating Iron Ores As Developed At Waukon, Iowa, Ernest Wander
Professional Degree Theses
"The more or less impure iron bearing mineral occurs mixed with a very tenacious clay, in which are also found chert, cretaceous quartz pebbles, pockets of sand, masses of pebbles and sand cemented by hydrous iron oxide, (which in some cases partly replaces the silica) and several varieties of fossils, such as crinoids etc. The impurities mentioned are often an integral part of the ore particles, and are present in varying quantities thruout [sic] the deposit. But, besides the foreign matter which the eye can discern, the apparently pure mineral contains a varying percentage of silica and alumina, (as well …
Some Typical Bridges For Logging Railroad Construction, Frederick Hauenstein
Some Typical Bridges For Logging Railroad Construction, Frederick Hauenstein
Professional Degree Theses
"In some of the pine regions of the Ozark Mountains, a considerable portion of the country is rolling and rough, comprising a succession of hills and hollows. The most efficient method of logging such a tract is obtained by locating the logging road so as to secure a down grade haul for the logs, with consequent up grade return for the empty cars. This necessitates locating the main line of the railroad along the principal creek, and then laying spurs up the different tributary creeks as they are met. Such a procedure requires much crossing and re-crossing of creeks and …
Concentration Of A Joplin Slime By Flotation, Earl Joseph Weimer, Walter Harry Freudenberg
Concentration Of A Joplin Slime By Flotation, Earl Joseph Weimer, Walter Harry Freudenberg
Bachelors Theses
"Concentration of the Joplin slimes by means of flotation is a subject receiving considerable attention at the present time, due to high price of zinc. These slimes are the accumulation of the finer particles of the ore during the milling process, and their zinc content is well worth considering. The practice in the past has been to sluice these slimes into the tailing pond, as no economical method of saving the zinc had been employed. The object of our experiment was to economically extract from these slimes by flotation, a product of sufficient zinc content to be of commercial value"--Introduction, …
Practical Details Of Mine Surveying In Certain Mines Of Northern Mexico, Arturo C. Fernandez
Practical Details Of Mine Surveying In Certain Mines Of Northern Mexico, Arturo C. Fernandez
Bachelors Theses
"The name of this thesis is suggestive of its character. The writer has endeavored to resent in a general way some of the most important details of mine surveying as he has found them in actual practice. For the sake of uniformity the engineering staff in which he worked prepared a set of instructions to be used by the engineers at the various mines. The methods and illustrations described in this paper have been adapted from these instructions and they afford a thorough foundation ready to receive the minor details best adapted to each particular mining district"--Foreword, page ii.
Simple Methods And Tables For Determining True Meridian, Howard Jones Teas
Simple Methods And Tables For Determining True Meridian, Howard Jones Teas
Bachelors Theses
"The ordinary methods of determining the true meridian by observation on either Polaris or the sun are so tedious to calculate that most surveyors and students dread making them. Observation on Polaris at either elongation or clumination sic require less calculation and are much simpler, but this simplicity is offset by the fact that they must be taken at an exact instant. If a cloud crosses the sky at the time, the surveyor has to wait until the next night. then again the observer must know the date, exact longitude and latitude and correct time for making the observation, and …
Selective Concentration Of A Complex Ore By Flotation, Paul Frederick Pape, Ralph Dale
Selective Concentration Of A Complex Ore By Flotation, Paul Frederick Pape, Ralph Dale
Bachelors Theses
"The problem of the Mining Engineer and Metallurgical Engineer who wishes to treat the slimes and fine sands of a complex ore is the recovery and separation of minerals so as to render a subsequent treatment of any mineral profitable. The minerals must be separated into groups which can be treated by different processes, because a combination of numerous minerals is extremely undesirable at the smelting plant. In a lead ore the presence of zinc often depletes its value to such an extent that it is unprofitable to treat it; likewise with other minerals and ores. Many systems of selective …
Concentration Of Ores By Flotation, John Gay Reilly, Frank Stillmann Elfred
Concentration Of Ores By Flotation, John Gay Reilly, Frank Stillmann Elfred
Bachelors Theses
"Flotation is a new step in the separation of valuable minerals from gangue. This process has only been in commercial use for about six years. There has been several theories advances as to how the ore is concentrated, and the theory that is now usually accepted is that the oil covers or wets the sulphide mineral particle and does not the gangue; and this mineral particle, by means of induced aid is concentrated on the surface. The authors of this thesis have not attempted to explain the reason or reasons why minerals will float; but have accepted the theories advanced …
The Voice Of The Phi Sigma -- 1916 --, Phi Sigma
The Voice Of The Phi Sigma -- 1916 --, Phi Sigma
The Voice of the Phi Sigma
This item is part of the Phi Sigma collection at the College Archives & Special Collections department of Columbia College Chicago. Contact [email protected] for more information and to view the collection.
Preliminary Report On The Property Of The Ruby Copper Company, Colwell Arba Pierce
Preliminary Report On The Property Of The Ruby Copper Company, Colwell Arba Pierce
Professional Degree Theses
"The property of the Ruby Copper Company is located in Township 21 S., Range 15 E., near the southern end of the Santa Rita Mountains, Wrightson Mining District, Santa Cruz County, Arizona. It is reached by a good wagon road from the town of Pantagonia, which, because of its location on the Benson to Nogales Branch of the Southern Pacific Railroad, is the supply point for a large mining section--page 1.
Notes On Mine Operations Of The American Zinc Company Of Tennessee, Homer Kent Sherry
Notes On Mine Operations Of The American Zinc Company Of Tennessee, Homer Kent Sherry
Professional Degree Theses
"The zinc ores mined at and near Mascot, Tennessee, are found in the upper part of the Knox dolomite which according to Keith was laid down in the middle Cambrian or Silurian age. This formation has a thickness of several thousand feet and is composed of layers of dolomite, limestone, sandstone, shale and some chert. The ore bearing portion at least is much folded with minor faulting and high brecciation. The axis of the folds lie Northeast by Southwest with the faulting in the same direction. The ore being mined is found on the Southeast dip in a fairly definite …
Comparison Of Operating Expenses And Capital Expenditures Of Two Different Types Of Boiler Rooms Covering Extensions Expected During The Next Twenty Years, George Hewitt Boyer
Comparison Of Operating Expenses And Capital Expenditures Of Two Different Types Of Boiler Rooms Covering Extensions Expected During The Next Twenty Years, George Hewitt Boyer
Professional Degree Theses
"This thesis applies to a central power station located in a rapidly growing manufacturing city with a present population of 40,000. The station is connected by high voltage transmission lines with six hydro and steam generating stations located in other cities. These transmission lines are mainly for emergency purposes so that this report considers that the station here studied will carry its full load. The boiler room is the only part of the station considered in this thesis as a previous study showed that there was ample space in the engine room for turbo-generator for years to come"--Introduction, page 1.
Cyaniding The Buckhorn Clay, Paul Richardson Cook
Cyaniding The Buckhorn Clay, Paul Richardson Cook
Professional Degree Theses
"The Buckhorn, Nevada, gold mine is peculiar in being a shallow kaolinized mass of material with basalt walls, having no direct connection with any of the usual gold bearing rocks, the average ore containing 16% water of hydratum. the cyaniding of this hydrant clayey material offered unusual difficulties compared with the usual gold quartz ore of Nevada. The ore body was thoroughly developed; then the mill was built according to the latest cyanide practice, with such changes as was thought the peculiar nature of this ore demanded. Upon starting the mill, the ore proved more difficulty to handle than had …
A Wet Process For The Extraction Of Mercury, Robert Glenn Sickly
A Wet Process For The Extraction Of Mercury, Robert Glenn Sickly
Professional Degree Theses
"In this paper it will be the aim of the writer to deal as exclusively as possible with the Mercury Extraction Process as applied at the High-Grade Plant of the Buffalo Mines, Limited, Cobalt, Ontario, Canada. it will be necessary at times to refer to the treatment of the ore for the extraction of silver"--Introduction, page 2.
Mill Test And Conclusion Leading To The Design Of An Addition To Florida Pebble Phosphate Concentrator, Norman L. Ohnsorg
Mill Test And Conclusion Leading To The Design Of An Addition To Florida Pebble Phosphate Concentrator, Norman L. Ohnsorg
Professional Degree Theses
"The fact that 30% to 50% of the phosphate mined in this district is lost as tailing due to an inadequate method of concentration has caused no small concern and many attempts have been to develop a method, of economic value, for saving the phosphate lost"--Existing Conditions of Milling, Page 1.
A Report On "La Cotabambas Auraria" Mining Company, Hector Julio Boza
A Report On "La Cotabambas Auraria" Mining Company, Hector Julio Boza
Professional Degree Theses
"The present report, relative to the studies on the value of Cochasayhuas and descriptive of what was discovered and worked by me in that mining district, is written in fulfilment [sic] the commission which was entrusted to me at the begining [sic] of the month of April last. Special circumstances give to the studies made and conclusions formed a certain and appreciable value. There already existing in the Company's works various crushing machines and small tanks for cyaniding, I was able to see in great part the results of my tests with the metal in the chemical laboratory, in the …
The Development Of A Copper-Silver Ore Body, Colwell Arba Pierce
The Development Of A Copper-Silver Ore Body, Colwell Arba Pierce
Bachelors Theses
"During the years 1912 to 1915 the writer had charge of the Ruby Copper Company property near Patagonia, Arizona, and it was suggested that a review of this work, with costs and data, would be helpful to other engineers engaged in similar enterprises"--Introduction, page 2.