Digital Commons Network^™

A Study For Comparative Costs Of Flat, Short Span, Concrete Steel Highway Bridges, Thomas Purcell Mccague

Bachelors Theses

"The importance of steel in the construction of long span highway bridges is well understood, but it's cost and the constant heavy maintenance charges, or it's rapid deterioration, if not properly maintained, have caused builders of bridges to seek some other material, which is low is first cost and which will not require constant painting. Se we consider concrete and concrete steel"--page 2.

Oils And Flotation, Clarence Eugene Peterson, Charles Yancey Clayton

Bachelors Theses

"We know that the sulphides, or minerals with a metallic lustre, can be floated either with or without oil and that the carbonates, silicates, etc., cannot be floated so readily. Why do certain oils have the power of selecting certain minerals? Why do certain oils produce froth? Why do certain oils give a watery froth? Why do some give an ephemeral froth and others a tough one? Of the thousands of oils known, only a few classes have found successful application in this new process...This leads us to the question, what property or combination of properties make oils valuable as …

Treatment Of A Complex Ore, Earl Burdette Weiberg, Hugo Edward Koch

Bachelors Theses

"Many complex ores are found in the West, which contain zinc in large quantities together with lead, copper, gold, and silver in sufficient amounts to yield a good profit could they be separated from the zinc economically, If such an ore were sent to the smelter to be treated in a blast furnace for the recovery of lead, copper, gold, and silver the smelter would penalize the shipper for all zinc over ten percent. On the other hand if the ore were sent to a zinc smelter for direct treatment there would be a penalty for excess lead present, and …

Notes On The Development Of The Flotation Process For Concentrating Copper And Iron Sulphide Ore, Holman Thompson Marshall

Bachelors Theses

"The first flotation machines was installed at the Magna Mill of the Utah Copper Co. in August and September, 1914. The outbreak of the war in Europe having made necessary the shutting down of the Arthur Mill of the same company, the flotation plant was installed at Magna for the purpose of carrying on experiments which had been in process at Arthur. Enough experimentation had been done with the small laboratory machine at Arthur, and results obtained were favorable enough to warrant the installation of a full size Janney machine"--page 1.

Problems In Flotation, William Henry Mccartney

Bachelors Theses

"Little has been done to classify oils on the basis of their action as flotation agents, either for their frothing or their selective qualities...This investigation was undertaken chiefly to aid in effecting such a classification"--page 3.

Design Of A Wooden Roof Truss Materials, William Herman Meyer

Bachelors’ Theses

No abstract provided.

Commutation, John Th. Mueller, Edward J. Blackwell

Bachelors’ Theses

The E.M.F. induced in the armature conductors of practically all direct current generators is alternating, and in order to obtain a unidirectional E.M.F. at the terminals of the the machine, it is necessary to reverse the connection at the moment the induced E.M.F. changes its direction.

Test Of A 400 Pound Refrigerating Plant, Louis C. Fenelon, George C. Hoffman, Thomas H. Noon, John T. Watry

Bachelors’ Theses

The primary object of these tests was to obtain the capacity of the refrigerating plant under various conditions of suction and condenser pressure.

The secondary object was to obtain the cost of electric current and water per ton of ice melting capacity.

Incidental objects pertained to heat transmission per sq. ft. of surface through the cooling coil.

The Design And Construction Of A Current Transformer, Henry A. Schmitz Jr., Jas. W. Murphy

Bachelors’ Theses

The transformer is a piece of apparatus used to transform alternating current power, from high voltage and low current to low voltage and high current or vice versa. It consists of a magnetic circuit of laminated iron linking two separate and distinct coils of wire. Alternating current is supplied to one of these coils, called the primary, and this alternating current causes rapid reversals of magnetic flux through the magnetic circuit, these reversals of flux induce an alternating electromotive force in the other coil, called the secondary, which delivers alternating current to a receiving circuit. The laminated iron which forms …

Lignite Producer Plant, Harry J. Read, G. R. Thatcher

Undergraduate Theses and Senior Projects

No abstract provided.

The Thermal Conductivity Of Refractories, Boyd Dudley Jr.

Professional Degree Theses

"The usefulness of correct data in regard to the thermal conductivity of refractories and other materials used in the construction of metallurgical and industrial furnaces is quite generally recognized. Numerous investigations of this property of refractories have been conducted, and in many cases the published data of different investigators are somewhat conflicting. This is particularly true of figures pertaining to materials intended for use at high temperatures, and it is with such materials that the metallurgist is mot interested. The difficulties in the way of precise determinations of thermal conductivities at elevated temperatures are numerous, and it is not particularly …

The Seneca-Superior Mine And Mill, Maurice Merton Albertson

Professional Degree Theses

"The Seneca Superior Mine lies under Cart Lake which is located about a mile south of the city of Cobalt. It was discovered by crosscutting during the year 1912 and although it is one of the smaller properties of the Cobalt district it has been, and continues to be, a large producer"--Description of the Seneca Superior Mine, page 1.

The Development Of A Process For The Treatment Of A Complex Ore, Charles Adrian Burdick

Professional Degree Theses

"The writer has carried out tests to determine the most feasible method of treating a complex ore from Tecolote, Sonoro [sic], Mexico. The ore contains gold, silver, copper and zinc"-- Introductory, page 1.

Study Of The Monthly Extraction Record And Curve Of A Modern Mexican Cyanide Plant, George William Harris

Professional Degree Theses

"This data is taken from the records of the mill and cyanide plant belonging to Compania de Minas La Blanca y Anexas, S.A., Pachuca, Hidalgo, Mexico; of which the writer has been in charge during the four years it has been in operation. The plant may be termed a "silver plant" as the silver values predominate, the ratio being about 200 grams of silver to 1 gram of gold"--Introduction, page 1.

An Investigation In Treating A Gold Ore From Custer, South Dakota, Theodore Saunders Dunn

Professional Degree Theses

"The following investigation was undertaken to determine the adaptibility [sic] to amalgamation and cyanidation of a certain ore from the property of Mr. Charles Bush near Custer, South Dakota. A preliminary sample of the ore was obtained and laboratory tests made upon it. A ton lot of the ore was then put through the ore dressing laboratory at the South Dakota School of Mines. Upon examination the large sample was found to differ in value and to some extent in character from the preliminary sample, but the scheme of treatment worked out for the first sample was found to work …

The Design Of A Reinforced Concrete Arch Highway Bridge, Clinton Dewitt Smith

Bachelors Theses

"The Subject of this theses is the Design of a Reinforced Concrete Arch Highway Bridge. In making the Design the crossing of South River Street, Austin Minn., was taken as the hypothetical location of the bridge and the design made with reference to the requirements of this location. These requirements are no more than those for an ordinary rural highway bridge. While in the city of Austin it is not in the route of travel to and from the depots and is hence not subjected to the loads due to heavy freighting. There is however a heavy rural traffic, this …

Engineering And Geological Work At Cananea, Mexico, Edward Dale Lynton

Professional Degree Theses

"The purpose of this thesis is to relate in as clear and concise a manner as possible the way "things are done" in practice as observed by myself during my two years' experience as sampler and assistant geologist to the Cananea Consolidated copper Co. of Cananea, Sonora, Mexico. My work took me to all the mines, and in this way I was able to accurately observe the sampling, system of mining, geology, etc. of this famous and important camp"--page 1.

The Method Of Mining And Milling At The Rosiclare Lead And Fluor Spar Mines, Arthur Harrison Cronk

Professional Degree Theses

"The American fluor spar mines of economic importance are located in the Southern part of Illinois and Western Kentucky. The largest mines are in Hardin County, Illinois, Those in Kentucky are in Crittenden, Livingstone and Caldwell Counties. At the present time the Illinois mines are the largest producers. The two principal mining companies in operation are: The Rosiclare Lead & Fluor Spar Mines and the Fairview Fluorspar & Lead Mines. These mines are located about a half mile from Rosiclare which is on the Ohio River"--Location, page 1.

A Study Of The Stoping Efficiency And Ore Transportation Of The Arizona Copper Company At Morenci, Arizona, Robert Stanley Burg

Bachelors Theses

"The purpose of this paper is to give a description of the most important mining operations of the Arizona Copper Company at Morenci, Arizona, during the years 1911, 1912 and 1913. This work was planned in the engineering department by the mine superintendent, Mr. John Kiddie, while the author was employed in his office as chief mine surveyor from November 1911 to September 1913. As in other mining districts of the southwest, the rich contact and pocket, copper deposits in the Clifton-Morenci district have been nearly exhausted, necessitating the development and extraction of the low-grade porphyry deposits"--Introduction, Page 1.

Comparative Tests Of Piston-Drill Bits, Lister Merriken Cummings

Bachelors Theses

"The purpose of this investigation is to compare the relative cutting speeds and efficiency of some of the different types of rock drill bits used in the piston machine, including the regular cross bit, the low center cross bit, a so-called "flat" cross bit, the "Z" bit of the southeast Missouri type, and the Joplin "Bull" bit"--page 2.

An Efficiency Test Of A Laboratory Fan, Daniel Webster Blaylock, Edward Albrecht Schroer, Elton Arthur Miller

Bachelors Theses

"The principal object of these tests is to determine the efficiency of the fan when working against the different sized orifices at various speeds and pressures. Before this could be accomplished, the coefficients of discharge of the 18 in., 24 in., and 30 in. orifices had to be determined"--Object of Tests, page 4.

Structural Material Requirements In Municipal Building Codes, August Wilhelm Gleason

Bachelors Theses

"An examination of the various Building Codes and ordinances of American cities shows some little variation in requirements and specifications for structural Each writer or engineer, to whom has been assigned the task of preparing the several codes, has had individual theory or rule which he embodies in the work while holding in the main to the generally accepted provisions. It is for the purpose of comparing the variations in the different codes with the hope of deducing what might be considered as standard practice, that this investigation has been started"--page 4.

Effect Of Compression And Transmission On The Illuminating And Heating Value Of Carburetted Water-Gas, Horace Herbert Clark

Bachelors Theses

"The object of this series of tests was to determine the effect of compression upon the candle power of carburetted water gas, as made in the daily operation of a three piece water gas machine, cooled in condensers, passed through shavings, scrubbers and oxide material, and thence into a storage holder, ready for compression and distribution. The apparatus consisted of a small Westinghouse air compressor; nine storage tanks of six inch wrought iron pipe; transfer pump; pressure regulator; standard one hundred inch bar photometer, complete, with regulators, clock, meter, pentane lamp, etc., gas analysis outfit, complete; also gages, thermometers, etc."--Page …

The Cyaniding Of A Mexican Silver Ore, Homer Marvon Wilson, Roy Watson Griffin

Bachelors Theses

"The purpose of this thesis is to determine whether or not a certain Mexican silver ore is amenable to cyanidation"--Purpose, page 1.

Flotation Applied To A Mexican Silver Ore, Albert Leo Trent

Bachelors Theses

"The object of this thesis is to determine the advisability of treating this Mexican Silver ore by flotation. To do this it was necessary to determine the degree of crushing, the kind and amount of oil, the amount of acid, the time of agitation, and the dilution of pulp, which would give the best results. From the following tests a suitable conclusion of the best conditions of this ore was determined"--Introduction, page 1.

The Relation Of The Composition Of Petroleum To Its Origin And Occurrence, John Warder Shotwell

Bachelors Theses

"Petroleum Is a mixture of hydrocarbons. It is a liquid varying from colorless, through yellow and brown to black. It varies from 1.0 to 0.80 in specific gravity, which corresponds to 10° to 45° Beaume. It varies widely in physical properties, such as viscosity, ignition point, polarization of light, etc. Chemically it is composed essentially of carbon and hydrogen, but usually contains impurities such as sulphur and nitrogen. The carbon and hydrogen combine with each other to form certain series, or "chains"--Chemical and Physical Nature, page 1.

Geological Mapping Of An Area Along The Frisco Railroad Between Cuba And Saint James, Willard Miles Benham, William Elliott

Bachelors Theses

"The chief object of the work has been the location of the Roubidoux-Jefferson City contact, if it occurred within a mile of the railroad. Distances and positions along the track were obtained by the use of a map and by counting telephone poles. Other locations were made by obtaining their bearing and distance from these points by the use of a compass and by pacing. Elevations were carried by aneroid barometers, using the railroad elevations at mile points as bench marks. An attempt has been made to locate all important outcrops; but these are shown only on the field map. …

Design Of Three Span Reinforced Concrete Arched R.R. Viaduct, Joseph James Shabart

Bachelors’ Theses

Reinforced concrete either, as arch or girder spans, is being used not only in preference to steel trusses or steel girders, where the stone arch is too expensive to be considered, but the concrete bridge is frequently replacing the old steel structure.

A Study Of Induction Motors, Michael P. Valle

Bachelors’ Theses

The induction rotor is tho most popular type of alternating current motor, and finds a wide field of application, Its action is based on the principle of the revolving magnetic field produced by alternating current displaced in phase relative to each other. At least two currents of different phase are necessary in order to produce a revolving field.

Testing Of The Racine Street Highway Bridge: City Of Milwaukee, Gardner P. Allen, Ernest Gomez Arzapalo

Bachelors’ Theses

The object of this test was to determine experimentally, the live load stresses in the main members of the Racine Street Bridge, and thus to ascertain whether or not the theoretical live and dead load stresses were greater or less than the theoretical dead load plus the actual live load stresses. If less, the bridge could not be considered safe for the traffic which it now carries. The dead load stresses in the various members were determined analytically, and to these were added the respective live load stresses obtained by this test, thus obtaining the total stress in the various …